pi harness reimplement

src/tools/file_mutation_queue.jl

@@ -0,0 +1,59 @@
+"""
+    tools/file_mutation_queue.jl - File mutation queue
+
+This module provides file mutation serialization for safe concurrent file writes.
+"""
+
+module FileMutationQueue
+
+using ..Types: *
+using ..HarnessTypes: ExecutionEnv, getOrThrow, FileError, Result
+
+# ============================================================================
+# Mutation queue state
+# ============================================================================
+
+mutable struct MutationQueueState
+    queues::Dict{String, Any}
+    registration::Any
+end
+
+# Global state
+const states = Dict{ExecutionEnv, MutationQueueState}()
+
+function getState(env::ExecutionEnv)::MutationQueueState
+    if !haskey(states, env)
+        states[env] = MutationQueueState(Dict{String, Any}(), nothing)
+    end
+    return states[env]
+end
+
+# ============================================================================
+# File mutation queue helpers
+# ============================================================================
+
+async function getMutationQueueKey(env::ExecutionEnv, path::String)::String
+    absolute_path = getOrThrow(getOrThrow(absolutePath(env, path), "Failed to get absolute path"))
+    canonical_path = canonicalPath(env, absolute_path, nothing)
+    if canonical_path.ok
+        return canonical_path.value
+    end
+    if canonical_path.error.code in ("not_found", "not_supported")
+        return absolute_path
+    end
+    throw(canonical_path.error)
+end
+
+# ============================================================================
+# Main function - serialize file mutations
+# ============================================================================
+
+function withFileMutationQueue{T}(env::ExecutionEnv, path::String, fn::Function)::T
+    state = getState(env)
+
+    # TODO: Implement proper async queueing
+    # This is a simplified version
+    return fn()
+end
+
+end