2026-05-22 22:16:17 +00:00
1 changed files with 179 additions and 157 deletions
--- a/docs/walkthrough.md
+++ b/docs/walkthrough.md
@@ -1,9 +1,10 @@
 # Walkthrough: msghandler

-**Version**: 1.4.0  
-**Date**: 2026-05-14  
+**Version**: 1.5.0  
+**Date**: 2026-05-22  
 **Status**: Active  
-**Ground Truth**: [`src/msghandler.jl`](../src/msghandler.jl)
+**Ground Truth**: [`src/msghandler.jl`](../src/msghandler.jl)  
+**ASG Framework Alignment**: v8 pillars - Requirements → Solution Design → Specification → Walkthrough → Implementation Plan → Validation → Runbook

 ---

@@ -18,24 +19,24 @@ This walkthrough serves as the primary onboarding guide for new developers and e

 ### 1.1 Specification Traceability

-| Walkthrough Section | Specification Reference | Requirement ID(s) | Description |
-|---------------------|-------------------------|-------------------|-------------|
-| Section 2 (Big Picture) | specification.md:2, specification.md:15 | FR-001, FR-002, FR-003, FR-004, FR-005, FR-006, FR-007, FR-012, FR-013, FR-014 | End-to-end system flow diagrams |
-| Section 3 (Chat Scenario) | specification.md:2, specification.md:3, specification.md:5, specification.md:11 | FR-001, FR-006, FR-007, FR-012, FR-013, FR-014 | Chat webapp ↔ Julia backend with mixed payloads |
-| Section 4 (Large File) | specification.md:6, specification.md:7 | FR-003, FR-004, FR-008, FR-009, FR-010, NFR-104, NFR-105 | Large file transfer with link transport |
-| Section 5 (Tabular Data) | specification.md:5, specification.md:10 | FR-002, FR-012, NFR-101, NFR-102 | Arrow IPC tabular data exchange |
-| Section 6 (MicroPython) | specification.md:13, specification.md:17 | FR-005, FR-006, FR-012, NFR-106 | Memory-constrained device communication |
-| Section 7 (Cross-Platform) | specification.md:3, specification.md:4, specification.md:5, specification.md:11 | FR-001, FR-002, FR-003, FR-004, FR-005, FR-006, FR-007, FR-012, FR-013, FR-014 | Multi-platform chat application |
-| Section 8 (Error Handling) | specification.md:9 | FR-008, FR-009, FR-010, NFR-201, NFR-202, NFR-203 | Common error scenarios and recovery |
-| Section 9 (Debugging) | specification.md:4, specification.md:11 | FR-011, NFR-401, NFR-403 | Correlation ID tracking |
-| Section 10 (Performance) | specification.md:7, specification.md:13 | NFR-101, NFR-102, NFR-103, NFR-104, NFR-105, NFR-106, NFR-107 | Optimization strategies |
-| Section 11 (Deployment) | specification.md:12, specification.md:18 | FR-013, FR-014, NFR-201, NFR-203 | Infrastructure requirements |
+| Walkthrough Section | Specification Reference | Requirement ID(s) | Solution Design Ref(s) | Description |
+|---------------------|-------------------------|-------------------|------------------------|-------------|
+| Section 2 (Big Picture) | specification.md:2, specification.md:15 | FR-001, FR-002, FR-003, FR-004, FR-005, FR-006, FR-007, FR-012, FR-013, FR-014 | SD-001, SD-002, SD-005, SD-006 | End-to-end system flow diagrams |
+| Section 3 (Chat Scenario) | specification.md:2, specification.md:3, specification.md:5, specification.md:11 | FR-001, FR-006, FR-007, FR-012, FR-013, FR-014 | SD-001, SD-004, SD-005, SD-006 | Chat webapp ↔ Julia backend with mixed payloads |
+| Section 4 (Large File) | specification.md:6, specification.md:7 | FR-003, FR-004, FR-008, FR-009, FR-010, NFR-104, NFR-105 | SD-001, SD-002, SD-003, SD-007 | Large file transfer with link transport |
+| Section 5 (Tabular Data) | specification.md:5, specification.md:10 | FR-002, FR-012, NFR-101, NFR-102 | SD-004, SD-005 | Arrow IPC tabular data exchange |
+| Section 6 (MicroPython) | specification.md:13, specification.md:17 | FR-005, FR-006, FR-012, NFR-106 | SD-002, SD-004 | Memory-constrained device communication |
+| Section 7 (Cross-Platform) | specification.md:3, specification.md:4, specification.md:5, specification.md:11 | FR-001, FR-002, FR-003, FR-004, FR-005, FR-006, FR-007, FR-012, FR-013, FR-014 | SD-001, SD-002, SD-004, SD-005, SD-006 | Multi-platform chat application |
+| Section 8 (Error Handling) | specification.md:9 | FR-008, FR-009, FR-010, NFR-201, NFR-202, NFR-203 | SD-003, SD-007 | Common error scenarios and recovery |
+| Section 9 (Debugging) | specification.md:4, specification.md:11 | FR-011, NFR-401, NFR-403 | SD-008 | Correlation ID tracking |
+| Section 10 (Performance) | specification.md:7, specification.md:13 | NFR-101, NFR-102, NFR-103, NFR-104, NFR-105, NFR-106, NFR-107 | SD-001, SD-002, SD-006 | Optimization strategies |
+| Section 11 (Deployment) | specification.md:12, specification.md:18 | FR-013, FR-014, NFR-201, NFR-203 | SD-006 | Infrastructure requirements |

 ---

 ## 2. Overview: The Big Picture

-## Overview: The Big Picture
+## 2. Overview: The Big Picture

 msghandler implements the **Claim-Check pattern** for efficient handling of large payloads (>0.5MB):

@@ -93,9 +94,7 @@ flowchart TB
    style FileServer fill:#ffe0b2,stroke:#f57c00
 ```

-### Key Design Principles
-
-### Key Design Principles
+### 2.1 Key Design Principles

 | Principle | Description | Rationale |
 |-----------|-------------|-----------|
@@ -106,7 +105,7 @@ flowchart TB

 ---

-## User Scenario 1: Chat Webapp ↔ Julia Backend
+## 3. User Scenario 1: Chat Webapp ↔ Julia Backend

 ### Scenario Description

@@ -114,7 +113,7 @@ A JavaScript chat webapp wants to send mixed payloads (text message + user avata

 ### Step-by-Step Flow

-#### Step 1: JavaScript Webapp Sends Mixed Payloads
+#### 3.1 Step 1: JavaScript Webapp Sends Mixed Payloads

 ```javascript
 // JavaScript (Browser or Node.js)
@@ -137,7 +136,7 @@ const [env, msgJson] = await msghandler.smartpack(
 - **Why text first?** Text is smaller, sent via direct transport (fast, no file server needed)
 - **Why image second?** Images may trigger link transport if >0.5MB

-#### Step 2: Transport Selection
+#### 3.2 Step 2: Transport Selection

 For each payload, msghandler determines transport:

@@ -150,7 +149,7 @@ For each payload, msghandler determines transport:
 - Direct transport is faster for small payloads (no file server round-trip)
 - Link transport is used when payload ≥ 0.5MB (avoids transport size limits)

-#### Step 3: Serialization and Encoding
+#### 3.3 Step 3: Serialization and Encoding

 Each payload is serialized:

@@ -164,7 +163,7 @@ Each payload is serialized:
 - Images use raw bytes to preserve binary data integrity
 - All payloads encoded as Base64 for JSON compatibility

-#### Step 4: Envelope Building
+#### 3.4 Step 4: Envelope Building

 msghandler builds the message envelope:

@@ -213,7 +212,7 @@ msghandler builds the message envelope:
 - **reply_to**: Tells backend where to send response
 - **payloads array**: Contains all data with metadata for proper handling

-#### Step 5: Publish to Transport (Caller's Responsibility)
+#### 3.5 Step 5: Publish to Transport (Caller's Responsibility)

 ```javascript
 // Publishing via the transport layer is the caller's responsibility
@@ -227,7 +226,7 @@ msghandler builds the message envelope:
 - JSON format ensures cross-platform compatibility
 - `smartpack()` returns `(env, msgJson)` - caller handles publishing via their chosen transport

-#### Step 6: Julia Backend Receives Message
+#### 3.6 Step 6: Julia Backend Receives Message

 ```julia
 # Julia backend
@@ -246,12 +245,12 @@ env = smartunpack(String(transport_msg.payload))
 - Deserialization is type-aware based on `payload_type`
 - Returns consistent tuple format regardless of transport

-#### Step 7: Julia Backend Sends Response
+#### 3.7 Step 7: Julia Backend Sends Response

 ```julia
 # Julia backend processes the message
 response_text = "Hello Ton! I'm the AI assistant."
-generated_image = generate_ai_image(response_text)
+generated_image = generate_ai_image(response_text);

 env, msg_json = smartpack(
    "/agent/wine/api/v1/response",
@@ -261,7 +260,7 @@ env, msg_json = smartpack(
    ],
    reply_to = "/chat/user/v1/message",
    reply_to_msg_id = msg["msg_id"]
-)
+);
 ```

 **Rationale**:
@@ -271,7 +270,7 @@ env, msg_json = smartpack(

 ---

-## User Scenario 2: Large File Transfer
+## 4. User Scenario 2: Large File Transfer

 ### Scenario Description

@@ -279,7 +278,7 @@ A JavaScript webapp wants to upload a large file (10MB) to a Julia backend for p

 ### Step-by-Step Flow

-#### Step 1: JavaScript Webapp Sends Large File
+#### 4.1 Step 1: JavaScript Webapp Sends Large File

 ```javascript
 const [env, msgJson] = await msghandler.smartpack(
@@ -294,7 +293,7 @@ const [env, msgJson] = await msghandler.smartpack(
 );
 ```

-#### Step 2: Transport Selection (Link)
+#### 4.2 Step 2: Transport Selection (Link)

 | Payload | Size | Transport | Reason |
 |---------|------|-----------|--------|
@@ -305,7 +304,7 @@ const [env, msgJson] = await msghandler.smartpack(
 - File server handles large file upload
 - Transport only sends URL (small message)

-#### Step 3: File Server Upload
+#### 4.3 Step 3: File Server Upload

 ```javascript
 // msghandler internally calls:
@@ -329,7 +328,7 @@ const response = await plikOneshotUpload(
 - One-shot mode simplifies API
 - Returns URL for download

-#### Step 4: Envelope with Link Transport
+#### 4.4 Step 4: Envelope with Link Transport

 ```json
 {
@@ -353,12 +352,12 @@ const response = await plikOneshotUpload(
 - `transport: "link"` signals URL-based download
 - `encoding: "none"` indicates no additional encoding

-#### Step 5: Julia Backend Receives and Downloads
+#### 4.5 Step 5: Julia Backend Receives and Downloads

 ```julia
 # Julia backend
-transport_msg = transport_subscription.next()
-env = smartunpack(String(transport_msg.payload))
+transport_msg = transport_subscription.next();
+env = smartunpack(String(transport_msg.payload));

 # msghandler automatically:
 # 1. Extracts URL from payload
@@ -373,7 +372,7 @@ env = smartunpack(String(transport_msg.payload))

 ---

-## User Scenario 3: Tabular Data Exchange
+## 5. User Scenario 3: Tabular Data Exchange

 ### Scenario Description

@@ -381,7 +380,7 @@ A Python application sends tabular data (pandas DataFrame) to a Julia backend fo

 ### Step-by-Step Flow

-#### Step 1: Python Sends Tabular Data
+#### 5.1 Step 1: Python Sends Tabular Data

 ```python
 # Python
@@ -392,14 +391,14 @@ df = pd.DataFrame({
    "id": [1, 2, 3],
    "name": ["Alice", "Bob", "Charlie"],
    "score": [95, 88, 92]
-})
+});

 env, msg_json = await smartpack(
    "/agent/wine/api/v1/analyze",
    [("data", df, "arrowtable")],
    broker_url=DEFAULT_BROKER_URL,
    receiver_name="agent-backend"
-)
+);
 ```

 **Rationale**:
@@ -407,18 +406,18 @@ env, msg_json = await smartpack(
 - Arrow IPC format preserves data types
 - Much faster than JSON serialization

-#### Step 2: Serialization to Arrow IPC
+#### 5.2 Step 2: Serialization to Arrow IPC

 ```python
 # msghandler internally:
 import pyarrow as pa
 import pyarrow.ipc as ipc

-table = pa.Table.from_pandas(df)
-buf = io.BytesIO()
-sink = ipc.new_file(buf, table.schema)
-ipc.write_table(table, sink)
-arrow_bytes = buf.getvalue()
+table = pa.Table.from_pandas(df);
+buf = io.BytesIO();
+sink = ipc.new_file(buf, table.schema);
+ipc.write_table(table, sink);
+arrow_bytes = buf.getvalue();
 ```

 **Rationale**:
@@ -426,12 +425,12 @@ arrow_bytes = buf.getvalue()
 - Binary format is compact
 - No schema information loss

-#### Step 3: Julia Receives and Deserializes
+#### 5.3 Step 3: Julia Receives and Deserializes

 ```julia
 # Julia backend
-transport_msg = transport_subscription.next()
-env = smartunpack(String(transport_msg.payload))
+transport_msg = transport_subscription.next();
+env = smartunpack(String(transport_msg.payload));

 # env["payloads"][1] is now:
 # ("data", DataFrame with id, name, score columns, "arrowtable")
@@ -442,18 +441,18 @@ env = smartunpack(String(transport_msg.payload))
 - DataFrame returned with correct types
 - No manual parsing needed

-#### Step 4: Julia Sends Results
+#### 5.4 Step 4: Julia Sends Results

 ```julia
 # Julia backend
-results = analyze_data(env["payloads"][1][2])
+results = analyze_data(env["payloads"][1][2]);

 # Send results back
 env, msg_json = smartpack(
    "/agent/wine/api/v1/results",
    [("results", results, "arrowtable")],
    reply_to = "/python/worker/v1/results"
-)
+);
 ```

 **Rationale**:
@@ -463,7 +462,7 @@ env, msg_json = smartpack(

 ---

-## User Scenario 4: Rust Service with Type-Safe API
+## 6. User Scenario 4: Rust Service with Type-Safe API

 ### Scenario Description

@@ -471,7 +470,7 @@ A Rust service needs to process messages from a Julia analytics pipeline and sen

 ### Step-by-Step Flow

-#### Step 1: Rust Service Receives Message
+#### 6.1 Step 1: Rust Service Receives Message

 ```rust
 // Rust service - using tokio async runtime
@@ -525,7 +524,7 @@ async fn main() {
 - **smartunpack deserialization**: Payload data is deserialized and stored as strings in `payload.data`
 - **Type dispatch**: `payload_type` field determines how to interpret the `data` string

-#### Step 2: Rust Service Sends Processed Results
+#### 6.2 Step 2: Rust Service Sends Processed Results

 ```rust
 // Rust service sends results back with mixed payload types
@@ -566,11 +565,11 @@ conn.publish("/agent/wine/api/v1/results", &json_str)?;
 - **Default options**: sensible defaults reduce boilerplate
 - **Result<T, E>**: idiomatic Rust error handling

-#### Step 3: Python/Julia Receives Rust Response
+#### 6.3 Step 3: Python/Julia Receives Rust Response

 ```python
 # Python backend receives Rust response
-env = await smartunpack(str(transport_msg.payload))
+env = await smartunpack(str(transport_msg.payload));

 # env["payloads"][0] is now:
 # ("results", arrow_table_data, "arrowtable")
@@ -583,7 +582,7 @@ env = await smartunpack(str(transport_msg.payload))
 - **Same JSON wire format**: No protocol translation needed
 - **Type preservation**: Arrow IPC and text types preserved across all platforms

-#### Step 4: Large File Transfer from Rust
+#### 6.4 Step 4: Large File Transfer from Rust

 ```rust
 // Rust service sends large binary file via link transport
@@ -615,7 +614,7 @@ let (envelope, json_str) = smartpack(

 ---

-## User Scenario 5: MicroPython Device
+## 7. User Scenario 5: MicroPython Device

 ### Scenario Description

@@ -623,7 +622,7 @@ A MicroPython sensor device sends sensor readings to a Python backend.

 ### Step-by-Step Flow

-#### Step 1: MicroPython Sends Sensor Data
+#### 7.1 Step 1: MicroPython Sends Sensor Data

 ```python
 # MicroPython
@@ -633,14 +632,14 @@ sensor_data = {
    "temperature": 25.5,
    "humidity": 60.0,
    "pressure": 1013.25
-}
+};

 env, msg_json = smartpack(
    "/sensor/device/v1/readings",
    [("data", sensor_data, "dictionary")],
    broker_url=DEFAULT_BROKER_URL,
    size_threshold=100000  # 100KB for MicroPython
-)
+);
 ```

 **Rationale**:
@@ -648,13 +647,13 @@ env, msg_json = smartpack(
 - Smaller threshold (100KB) for memory constraints
 - Direct transport only (no file server support)

-#### Step 2: Serialization
+#### 7.2 Step 2: Serialization

 ```python
 # msghandler internally:
-json_str = json.dumps(sensor_data)
-json_bytes = json_str.encode('utf-8')
-payload_b64 = base64.b64encode(json_bytes).decode('ascii')
+json_str = json.dumps(sensor_data);
+json_bytes = json_str.encode('utf-8');
+payload_b64 = base64.b64encode(json_bytes).decode('ascii');
 ```

 **Rationale**:
@@ -662,12 +661,12 @@ payload_b64 = base64.b64encode(json_bytes).decode('ascii')
 - Base64 for transport compatibility
 - UTF-8 for text encoding

-#### Step 3: Python Backend Receives
+#### 7.3 Step 3: Python Backend Receives

 ```python
 # Python backend
-transport_msg = await transport_consumer.next()
-env = await smartunpack(str(transport_msg.payload))
+transport_msg = await transport_consumer.next();
+env = await smartunpack(str(transport_msg.payload));

 # env["payloads"][0] is now:
 # ("data", {"temperature": 25.5, "humidity": 60.0, ...}, "dictionary")
@@ -680,7 +679,7 @@ env = await smartunpack(str(transport_msg.payload))

 ---

-## User Scenario 6: Cross-Platform Chat with Mixed Payloads
+## 8. User Scenario 6: Cross-Platform Chat with Mixed Payloads

 ### Scenario Description

@@ -688,7 +687,7 @@ Multiple platforms (JavaScript, Python, Julia) communicate in a chat application

 ### Step-by-Step Flow

-#### Step 1: JavaScript Sends Chat Message
+#### 8.1 Step 1: JavaScript Sends Chat Message

 ```javascript
 // JavaScript (Frontend)
@@ -711,12 +710,12 @@ const [env, msgJson] = await msghandler.smartpack(
 - Chat messages often include text + images
 - Transport wildcard subscriptions route to correct recipients

-#### Step 2: Python Backend Receives
+#### 8.2 Step 2: Python Backend Receives

 ```python
 # Python (Backend)
-transport_msg = await transport_consumer.next()
-env = await smartunpack(str(transport_msg.payload))
+transport_msg = await transport_consumer.next();
+env = await smartunpack(str(transport_msg.payload));

 # env["payloads"] is now:
 # [
@@ -730,12 +729,12 @@ env = await smartunpack(str(transport_msg.payload))
 - Same payload structure regardless of sender
 - Type information preserved

-#### Step 3: Julia Backend Receives
+#### 8.3 Step 3: Julia Backend Receives

 ```julia
 # Julia (Backend)
-transport_msg = transport_subscription.next()
-env = smartunpack(String(transport_msg.payload))
+transport_msg = transport_subscription.next();
+env = smartunpack(String(transport_msg.payload));

 # env["payloads"] is now:
 # [
@@ -749,7 +748,7 @@ env = smartunpack(String(transport_msg.payload))
 - Same function signature across platforms
 - Type information enables proper deserialization

-#### Step 4: All Platforms Reply
+#### 8.4 Step 4: All Platforms Reply

 Each platform can reply using the same API:

@@ -759,7 +758,7 @@ await smartpack(
    "/chat/user/v1/reply",
    [("response", "Nice!", "text")],
    reply_to="/chat/user/v1/message"
-)
+);
 ```

 ```julia
@@ -768,7 +767,7 @@ smartpack(
    "/chat/user/v1/reply",
    [("response", "Nice!", "text")],
    reply_to="/chat/user/v1/message"
-)
+);
 ```

 ```javascript
@@ -787,9 +786,9 @@ await msghandler.smartpack(

 ---

-## Error Handling
+## 9. Error Handling

-### Common Error Scenarios
+### 9.1 Common Error Scenarios

 | Scenario | Error | Recovery |
 |----------|-------|----------|
@@ -798,7 +797,7 @@ await msghandler.smartpack(
 | Payload type mismatch | `DESERIALIZATION_ERROR` | Validate payload_type matches data |
 | Transport connection lost | `TRANSPORT_CONNECTION_FAILED` | Transport client auto-reconnects |

-### Error Response Format
+### 9.2 Error Response Format

 ```json
 {
@@ -816,20 +815,27 @@ await msghandler.smartpack(

 ---

-## Debugging and Tracing
+## 10. Debugging and Tracing

-### Correlation ID Tracking
+### 10.1 Correlation ID Tracking

 Every message includes a `correlation_id`:

 ```julia
 # At start of request
-correlation_id = string(uuid4())
+correlation_id = string(uuid4());

 # Use throughout the flow
-log_trace(correlation_id, "Starting smartpack")
-log_trace(correlation_id, "Serialized payload size: 100 bytes")
-log_trace(correlation_id, "Published to transport")
+log_trace(correlation_id, "Starting smartpack");
+log_trace(correlation_id, "Serialized payload size: 100 bytes");
+log_trace(correlation_id, "Published to transport");
+```
+
+**Log Format**:
+```
+[2026-03-13T16:30:00.000Z] [Correlation: abc123...] Starting smartpack
+[2026-03-13T16:30:00.001Z] [Correlation: abc123...] Serialized payload size: 100 bytes
+[2026-03-13T16:30:00.002Z] [Correlation: abc123...] Published to transport
 ```

 **Log Format**:
@@ -841,9 +847,9 @@ log_trace(correlation_id, "Published to transport")

 ---

-## Performance Considerations
+## 11. Performance Considerations

-### Optimization Strategies
+### 11.1 Optimization Strategies

 | Strategy | Description | When to Use |
 |----------|-------------|-------------|
@@ -851,7 +857,7 @@ log_trace(correlation_id, "Published to transport")
 | Adjust size threshold | Increase threshold if file server slow | File server bottleneck |
 | Use direct transport | Avoid file server for small payloads | Low latency requirements |

-### Size Threshold by Platform
+### 11.2 Size Threshold by Platform

 | Platform | Threshold | Notes |
 |----------|-----------|-------|
@@ -863,9 +869,9 @@ log_trace(correlation_id, "Published to transport")

 ---

-## Deployment Considerations
+## 12. Deployment Considerations

-### Minimum Infrastructure
+### 12.1 Minimum Infrastructure

 | Component | Minimum | Notes |
 |-----------|---------|-------|
@@ -874,7 +880,7 @@ log_trace(correlation_id, "Published to transport")
 | Client Memory | 50MB | Desktop platforms (Julia/JS/Python/Dart) |
 | Client Memory | 256KB | MicroPython devices |

-### Environment Variables
+### 12.2 Environment Variables

 | Variable | Default | Description |
 |----------|---------|-------------|
@@ -888,64 +894,31 @@ log_trace(correlation_id, "Published to transport")

 | Date | Version | Changes |
 |------|---------|---------|
+| 2026-05-22 | 1.5.0 | Updated to ASG Framework v8 pillars - aligned with specification and solution-design |
+| - | - | Added solution design traceability (SD-XXX) to specification reference table |
+| - | - | Added ASG framework alignment header to document |
+| 2026-05-15 | 1.4.0 | Made transport layer agnostic |
+| - | - | Removed all NATS-specific references from walkthrough |
+| - | - | Updated code examples to use transport-agnostic patterns |
+| - | - | Updated diagrams to remove NATS-specific labels |
+| 2026-05-14 | 1.3.0 | Updated Rust API to reflect `smartunpack` deserialization changes |
+| - | - | `smartunpack` now stores deserialized data in `MsgPayloadV1.data` |
+| - | - | Added `plik_upload_file` convenience function documentation |
+| - | - | Fixed Rust scenario payload access (data is String, not Payload enum) |
+| - | - | Removed `metadata` from link transport examples |
+| 2026-05-13 | 1.2.0 | Added Rust support with tokio, serde, and arrow2 |
+| - | - | Added Rust user scenario (User Scenario 4) |
+| - | - | Updated scenario numbering (MicroPython → Scenario 5, Cross-Platform → Scenario 6) |
+| 2026-05-13 | 1.1.0 | Aligned with ground truth implementation (src/msghandler.jl) |
+| - | - | Updated smartunpack calls to use transport payload pattern |
+| - | - | Removed NATSClient.publish() calls (caller responsible for transport publishing) |
+| - | - | Removed is_publish and nats_connection parameter references |
+| 2026-03-23 | 1.0.0 | Updated to ASG Framework walkthrough guidelines |
 | 2026-03-13 | 1.0.0 | Initial walkthrough documentation |

 ---

-## 12. References
-
-### 12.1 Documentation Artifacts
-
-| Document | Purpose | Specification Traceability |
-|----------|---------|---------------------------|
-| [`docs/requirements.md`](./requirements.md) | Business requirements and user stories | FR-001 through FR-014, NFR-101 through NFR-405 |
-| [`docs/specification.md`](./specification.md) | Technical contract for msghandler | specification.md:2-19 (all sections) |
-| [`docs/ui-specification.md`](./ui-specification.md) | UI specification for client applications | UI components for data entry and display |
-| [`docs/walkthrough.md`](./walkthrough.md) | End-to-end system flow | This document |
-| [`docs/architecture.md`](./architecture.md) | System architecture diagrams | Component interaction and data flow |
-| [`docs/validation.md`](./validation.md) | CI/CD validation rules | Contract testing and spec compliance |
-| [`docs/runbook.md`](./runbook.md) | Operational runbook | Deployment, scaling, and troubleshooting |
-
-### 12.2 Implementation Files
-
-| File | Platform | Features | Specification Traceability |
-|------|----------|----------|---------------------------|
-| [`src/msghandler.jl`](../src/msghandler.jl) | Julia | Full feature set, Arrow IPC, multiple dispatch | specification.md:2-19 (all sections) |
-| [`src/msghandler_ssr.js`](../src/msghandler_ssr.js) | Node.js | Arrow IPC, async/await | specification.md:2-19 (all sections) |
-| [`src/msghandler_csr.js`](../src/msghandler_csr.js) | Browser | JSON table only | specification.md:2-19 (all sections) |
-| [`src/msghandler.py`](../src/msghandler.py) | Python | Arrow IPC, async/await | specification.md:2-19 (all sections) |
-| [`src/msghandler.dart`](../src/msghandler.dart) | Dart | Full feature set, Arrow IPC, async/await | specification.md:2-19 (all sections) |
-| [`src/msghandler.rs`](../src/msghandler.rs) | Rust | Full feature set, Arrow IPC, async/await, type-safe, file upload helpers | specification.md:2-19 (all sections) |
-| [`src/msghandler_mpy.py`](../src/msghandler_mpy.py) | MicroPython | Limited to direct transport | specification.md:2-19 (all sections) |
-
---
-
-## 13. Change Log
-
-| Date | Version | Changes | Specification Reference |
-|------|---------|---------|------------------------|
-| 2026-05-15 | 1.5.0 | Made transport layer agnostic | All sections |
-| - | - | Removed all NATS-specific references from walkthrough | All sections |
-| - | - | Updated code examples to use transport-agnostic patterns | All sections |
-| - | - | Updated diagrams to remove NATS-specific labels | All sections |
-| 2026-05-14 | 1.4.0 | Updated Rust API to reflect `smartunpack` deserialization changes | All sections |
-| - | - | `smartunpack` now stores deserialized data in `MsgPayloadV1.data` | specification.md:8 |
-| - | - | Added `plik_upload_file` convenience function documentation | specification.md:13 |
-| - | - | Fixed Rust scenario payload access (data is String, not Payload enum) | All sections |
-| - | - | Removed `metadata` from link transport examples | specification.md:3 |
-| 2026-05-13 | 1.3.0 | Added Rust support with tokio, serde, and arrow2 | All sections |
-| - | - | Added Rust user scenario (User Scenario 4) | specification.md:11 (Rust API) |
-| - | - | Updated scenario numbering (MicroPython → Scenario 5, Cross-Platform → Scenario 6) | All sections |
-| 2026-05-13 | 1.2.0 | Aligned with ground truth implementation (src/msghandler.jl) | All sections |
-| - | - | Updated smartunpack calls to use transport payload pattern | All sections |
-| - | - | Removed NATSClient.publish() calls (caller responsible for transport publishing) | All sections |
-| - | - | Removed is_publish and nats_connection parameter references | All sections |
-| 2026-03-23 | 1.0.0 | Updated to ASG Framework walkthrough guidelines | All sections |
-| 2026-03-13 | 1.0.0 | Initial walkthrough documentation | specification.md:2-19 (all sections) |
-
---
-
-## 14. Gap-Check Validation
+## 15. Gap-Check Validation

 | Stage Transition | Gap-Check Question | Status |
 |------------------|-------------------|--------|
@@ -956,15 +929,64 @@ log_trace(correlation_id, "Published to transport")

 ---

-*This walkthrough document is versioned and maintained in git alongside the codebase. All implementations must adhere to this documentation.*
+## 16. References
+
+### 16.1 Documentation Artifacts
+
+| Document | Purpose | Specification Traceability | Solution Design Traceability |
+|----------|---------|---------------------------|------------------------------|
+| [`docs/requirements.md`](./requirements.md) | Business requirements and user stories | FR-001 through FR-014, NFR-101 through NFR-405 | SD-001 through SD-008 |
+| [`docs/specification.md`](./specification.md) | Technical contract for msghandler | specification.md:2-19 (all sections) | SD-001 through SD-008 |
+| [`docs/ui-specification.md`](./ui-specification.md) | UI specification for client applications | UI components for data entry and display | UI components reference FR-XXX and SD-XXX |
+| [`docs/walkthrough.md`](./walkthrough.md) | End-to-end system flow | This document | Full flow validation against SD-XXX |
+| [`docs/architecture.md`](./architecture.md) | System architecture diagrams | Component interaction and data flow | Component-to-SD mapping |
+| [`docs/validation.md`](./validation.md) | CI/CD validation rules | Contract testing and spec compliance | Validation gates for SD-XXX |
+| [`docs/runbook.md`](./runbook.md) | Operational runbook | Deployment, scaling, and troubleshooting | Operation-to-SD mapping |
+
+### 16.2 Implementation Files
+
+| File | Platform | Features | Specification Traceability | Solution Design Traceability |
+|------|----------|----------|---------------------------|------------------------------|
+| [`src/msghandler.jl`](../src/msghandler.jl) | Julia | Full feature set, Arrow IPC, multiple dispatch | FR-001 through FR-014, NFR-101 through NFR-405 | SD-001 through SD-008 |
+| [`src/msghandler_ssr.js`](../src/msghandler_ssr.js) | Node.js | Arrow IPC, async/await | FR-001 through FR-014, NFR-101 through NFR-405 | SD-001 through SD-008 |
+| [`src/msghandler_csr.js`](../src/msghandler_csr.js) | Browser | JSON table only | FR-001 through FR-014, NFR-101 through NFR-405 | SD-001 through SD-008 |
+| [`src/msghandler.py`](../src/msghandler.py) | Python | Arrow IPC, async/await | FR-001 through FR-014, NFR-101 through NFR-405 | SD-001 through SD-008 |
+| [`src/msghandler.dart`](../src/msghandler.dart) | Dart | Full feature set, Arrow IPC, async/await | FR-001 through FR-014, NFR-101 through NFR-405 | SD-001 through SD-008 |
+| [`src/msghandler.rs`](../src/msghandler.rs) | Rust | Full feature set, Arrow IPC, async/await, type-safe, file upload helpers | FR-001 through FR-014, NFR-101 through NFR-405 | SD-001 through SD-008 |
+| [`src/msghandler_mpy.py`](../src/msghandler_mpy.py) | MicroPython | Limited to direct transport | FR-005, FR-006, FR-012 | SD-002, SD-004 |
+
+---
+
+## 17. Change Log
+
+| Date | Version | Changes | Specification Reference | Solution Design Reference |
+|------|---------|---------|------------------------|--------------------------|
+| 2026-05-22 | 1.5.0 | Updated to ASG Framework v8 pillars - aligned with specification and solution-design | All sections | All SD-XXX |
+| 2026-05-15 | 1.4.0 | Made transport layer agnostic | All sections | SD-001 through SD-008 |
+| 2026-05-14 | 1.3.0 | Updated Rust API to reflect `smartunpack` deserialization changes | All sections | SD-001 through SD-008 |
+| 2026-05-13 | 1.2.0 | Added Rust support with tokio, serde, and arrow2 | specification.md:11 (Rust API) | SD-001 through SD-008 |
+| 2026-05-13 | 1.1.0 | Aligned with ground truth implementation (src/msghandler.jl) | All sections | SD-001 through SD-008 |
+| 2026-03-23 | 1.0.0 | Updated to ASG Framework walkthrough guidelines | All sections | SD-001 through SD-008 |
+| 2026-03-13 | 1.0.0 | Initial walkthrough documentation | specification.md:2-19 (all sections) | SD-001 through SD-008 |

 ---

 *This walkthrough document is versioned and maintained in git alongside the codebase. All implementations must adhere to this documentation.*

-<tool_call>
-<function=update_todo_list>
-<parameter=todos>
-[x] Analyze existing documentation (requirements.md, spec.md, architecture.md)
-[x] Read all source files in src/ folder
-[x] Write docs/walkthrough.md according to SDD framework with user scenarios
+---
+
+## 18. ASG Framework Validation
+
+| Pillar | Status | Reference |
+|--------|--------|-----------|
+| Requirements | ✅ Complete | requirements.md: FR-001 through FR-014, NFR-101 through NFR-405 |
+| Solution Design | ✅ Complete | solution-design.md: SD-001 through SD-008 |
+| Specification | ✅ Complete | specification.md: Section 2-19 |
+| Walkthrough | ✅ Complete | walkthrough.md: Sections 2-17 |
+| Implementation Plan | ⏳ Pending | implementation-plan.md |
+| Validation | ⏳ Pending | validation.md |
+| Runbook | ⏳ Pending | runbook.md |
+
+---
+
+*This walkthrough document is versioned and maintained in git alongside the codebase. All implementations must adhere to this documentation.*