fix(P0): close 15 blockers + add 26 regression tests; fix wiring schema regression

Phase A (security red lines) — CLOSED:
- B8: 3x command injection fixed (execFileSync + args array in CMake/CppBuilder/Cppcheck)
- B6: ToolRegistry permission bypass fixed (real task_scope/profile passed)
- B7: ACTION_BRANCHES this-binding crash fixed (instance method)
- B17: DeveloperLogEncryptor hardcoded 'dev-key' removed (throws if no key)
- B22: CommandRiskAnalyzer 'in' operator bug fixed (includes)
- B1: EventStore.project() transaction handle now passed to all repos
- B2: workspace projection illegal enum fixed (active/merged)
- B4: route_prefix separator unified to '/'
- B5: TaskAttempt column mapping fixed

Other blockers fixed:
- B3: project-level DB schema aligned to db-schema §20 (.air/local, learned_memories)
- B9: cpp.* tools registered through PermissionEngine path
- B11: Scheduler BLOCKED/CANCELLED states added
- B18: CapabilityTrustLevel 5-level enum aligned
- B19: PermissionEngine block/refuse/announce_then_run + grant_scope
- B20: Worker exit code 4 = parent_cancelled
- B24: project_id now randomUUID

Regression fix (introduced by B3 schema refactor):
- wiring.ts capture_debug_record/promote_memory_entry realigned to
  refactored DebugRecord/MemoryEntry interfaces (was compile-level decoupling)

Tests: 128 regression/unit tests pass (22 regression + 3 unit + 3 e2e suites)

Still open (tracked for next round): B10 (INV-2 outbox emit), B12 (Scheduler
event projection), B13 (MainAgent LLM classify), B14 (IPC envelope fields),
B15 (TUI OpenTUI), B16 (api_key strict), B21 (CLI init INV-3), B23 (e2e real),
B25 (MVP tools), B26 (ContextAssembler L6-L9)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/runtime/src/context/ContextAssembler.ts

@@ -143,10 +143,37 @@ export class ContextAssembler {
       layers.push(...task_layers)
     }
 
-    // TODO(P3): L6 Evidence - load from EvidenceStore (read-only)
-    // TODO(P3): L7 Conversation - load from SessionStore message history
-    // TODO(P3): L8 Tool output - load recent tool results from SessionStore
-    // TODO(P3): L9 User override - load user directives/additional layers
+    // L6: Evidence - stub layer (to be loaded from EvidenceStore)
+    layers.push({
+      level: 'evidence',
+      priority: 6,
+      content: '',
+      token_estimate: 0
+    })
+
+    // L7: Conversation - stub layer (to be loaded from SessionStore message history)
+    layers.push({
+      level: 'conversation',
+      priority: 7,
+      content: '',
+      token_estimate: 0
+    })
+
+    // L8: Tool output - stub layer (to be loaded from SessionStore tool results)
+    layers.push({
+      level: 'tool_output',
+      priority: 8,
+      content: '',
+      token_estimate: 0
+    })
+
+    // L9: User override - stub layer (to be loaded from user directives/additional layers)
+    layers.push({
+      level: 'user_override',
+      priority: 9,
+      content: '',
+      token_estimate: 0
+    })
 
     // Add any additional layers
     if (context.additional_layers) {