Merge remote-tracking branch 'origin/master' into worktree-dynamic-workflows

Master's reconstructable-requests overhaul (#179) meets the workflow tool:
- subagent-inprocess structured-output nudge becomes a system-prompt section
  plus logged context (the injected-request waterfall shape is gone upstream)
- snapshot fixtures re-recorded on the merged tree so every request/header
  carries the workflow tool; authored error-finish/cancel headers patched to
  the merged tool list and system text
- architecture.md condensed back under its word ceiling; module graph regenerated

knip.json

@@ -21,6 +21,10 @@
       "project": ["src/**/*.ts"],
       "ignoreDependencies": ["cordis"]
     },
+    "packages/core/agent-loop": {
+      "entry": ["tests/**/*.spec.ts", "tests/**/*.e2e.ts"],
+      "project": ["src/**/*.ts", "tests/**/*.ts"]
+    },
     "packages/llm/llm-deepseek": {
       "entry": ["tests/**/*.spec.ts", "tests/**/*.e2e.ts"],
       "project": ["src/**/*.ts", "tests/**/*.ts"]