auth-yes/tasks/audits/2026-0827-audit-2-phase-4.md

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# Post-Implementation Audit: Phase 4 (Persistent Architectural Test Suite)
## 1. Test Suite & Verification
- **`deno fmt`**: Passed (All 6 architectural test suites formatted).
- **`deno task lint`**: Passed (`deno lint` and `scripts/lint_arch.ts` passed
with 0 errors; all files $\le 72$ lines, zero banned DOM API violations).
- **`deno task check`**: Passed across all workspace modules (`server/`, `sdk/`,
`ui/`, `infra/`, `src/`).
- **`deno test -A --no-check`**: Passed (90 tests across 30 steps with 0
failures).
## 2. Scope Implemented & Verified
1. **Transport Efficiency & Latency
(`src/tests/arch/transport_efficiency.test.ts`):**
- Asserts non-streaming point-to-point actions (`/join`, `/login`) execute
rapidly without SSE overhead.
- Asserts the 16KB payload ceiling guard rejects oversized bodies with
413/400.
2. **SSE Stream Lifecycle & Leak Teardown
(`src/tests/arch/sse_lifecycle.test.ts`):**
- Asserts `streamDatastar` handles client `AbortSignal` disconnects
gracefully and executes clean teardown logic.
3. **Proxy Buffering Invariant (`src/tests/arch/proxy_buffering.test.ts`):**
- Validates that streaming endpoints emit `X-Accel-Buffering: no` and
`Cache-Control: no-cache` headers to bypass reverse-proxy buffering.
4. **Error Fragment Morph Invariant (`src/tests/arch/error_fragment.test.ts`):**
- Validates that validation and route errors return HTML fragments targeting
`#status-banner` or `.field-error`.
5. **XSS & Escape Fuzzing Harness (`src/tests/arch/xss_fuzzing.test.tsx`):**
- Fuzzes event names, user labels, and usernames with `<script>`, `onerror=`,
and attribute breakout payloads to ensure Hono SSR JSX strictly escapes all
dynamic entities into safe HTML entities.
6. **Dual-Mode Content Negotiation
(`src/tests/arch/content_negotiation.test.ts`):**
- Tests `determineClientType()` across `datastar`, `browser`, `shell` (curl),
and `cli` (JSON) request profiles.
7. **Core Decoupling & Self-Containment:**
- 100% of all imports in `src/` are internal to `src/core/` and
`src/shared/ui/`.
- Zero legacy `server/` imports remain.
## 3. Decision
**Decision: APPROVED & GREEN.** 🟢 Phase 4 is complete, robust, and verified.