fix(coding-agent): add entry renderers for session entries

packages/coding-agent/test/session-manager/build-context.test.ts

@@ -1,8 +1,10 @@
 import { describe, expect, it } from "vitest";
 import {
 	type BranchSummaryEntry,
+	buildContextEntries,
 	buildSessionContext,
 	type CompactionEntry,
+	type CustomEntry,
 	type ModelChangeEntry,
 	type SessionEntry,
 	type SessionMessageEntry,
@@ -52,6 +54,10 @@ function branchSummary(id: string, parentId: string | null, summary: string, fro
 	return { type: "branch_summary", id, parentId, timestamp: "2025-01-01T00:00:00Z", summary, fromId };
 }
 
+function custom(id: string, parentId: string | null, customType: string, data?: unknown): CustomEntry {
+	return { type: "custom", id, parentId, timestamp: "2025-01-01T00:00:00Z", customType, data };
+}
+
 function thinkingLevel(id: string, parentId: string | null, level: string): ThinkingLevelChangeEntry {
 	return { type: "thinking_level_change", id, parentId, timestamp: "2025-01-01T00:00:00Z", thinkingLevel: level };
 }
@@ -169,6 +175,37 @@ describe("buildSessionContext", () => {
 			expect(ctx.messages).toHaveLength(4);
 			expect((ctx.messages[0] as any).summary).toContain("Second summary");
 		});
+
+		it("buildContextEntries returns compaction-aware entries including custom entries", () => {
+			const entries: SessionEntry[] = [
+				msg("1", null, "user", "first"),
+				custom("2", "1", "old-state", { hidden: true }),
+				msg("3", "2", "assistant", "response1"),
+				custom("4", "3", "kept-card", { title: "Kept" }),
+				msg("5", "4", "user", "second"),
+				compaction("6", "5", "Summary", "4"),
+				custom("7", "6", "after-card", { title: "After" }),
+				msg("8", "7", "assistant", "response2"),
+			];
+
+			expect(buildContextEntries(entries).map((entry) => entry.id)).toEqual(["6", "4", "5", "7", "8"]);
+			const ctx = buildSessionContext(entries);
+			expect(ctx.messages.map((message) => message.role)).toEqual(["compactionSummary", "user", "assistant"]);
+		});
+
+		it("keeps settings from the full path after compaction", () => {
+			const entries: SessionEntry[] = [
+				msg("1", null, "user", "first"),
+				thinkingLevel("2", "1", "high"),
+				msg("3", "2", "assistant", "response1"),
+				msg("4", "3", "user", "second"),
+				compaction("5", "4", "Summary", "4"),
+			];
+
+			const ctx = buildSessionContext(entries);
+			expect(ctx.thinkingLevel).toBe("high");
+			expect(ctx.messages.map((message) => message.role)).toEqual(["compactionSummary", "user"]);
+		});
 	});
 
 	describe("with branches", () => {