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/test/regression/context-assembler-layers.test.ts

@@ -0,0 +1,61 @@
+/**
+ * Regression test: ContextAssembler L6-L9 stub layers
+ *
+ * Verifies that L6-L9 layers are implemented as actual stub layer pushes,
+ * not just TODO comments.
+ */
+
+import { describe, test, expect } from 'bun:test'
+import { readFileSync } from 'fs'
+import { join } from 'path'
+
+const SOURCE_PATH = join(
+  import.meta.dir,
+  '..',
+  '..',
+  'src',
+  'context',
+  'ContextAssembler.ts'
+)
+
+const source = readFileSync(SOURCE_PATH, 'utf-8')
+
+describe('ContextAssembler L6-L9 stub layers', () => {
+  test('source has L6 evidence layer (not just TODO comment)', () => {
+    // TODO(P3): L6 should be gone
+    expect(source).not.toContain("TODO(P3): L6")
+    // 'evidence' level should exist as a pushed layer
+    expect(source).toContain("level: 'evidence'")
+  })
+
+  test('source has L7 conversation layer', () => {
+    expect(source).not.toContain("TODO(P3): L7")
+    expect(source).toContain("level: 'conversation'")
+  })
+
+  test('source has L8 tool_output layer', () => {
+    expect(source).not.toContain("TODO(P3): L8")
+    expect(source).toContain("level: 'tool_output'")
+  })
+
+  test('source has L9 user_override layer', () => {
+    expect(source).not.toContain("TODO(P3): L9")
+    expect(source).toContain("level: 'user_override'")
+  })
+
+  test('stub layers have priority values 6-9', () => {
+    expect(source).toContain('priority: 6')
+    expect(source).toContain('priority: 7')
+    expect(source).toContain('priority: 8')
+    expect(source).toContain('priority: 9')
+  })
+
+  test('stub layers have token_estimate: 0', () => {
+    // Each stub should set token_estimate to 0
+    const stubLayerPattern = /token_estimate:\s*0/g
+    const matches = source.match(stubLayerPattern)
+    // At least 4 occurrences (one per stub layer)
+    expect(matches).not.toBeNull()
+    expect(matches!.length).toBeGreaterThanOrEqual(4)
+  })
+})