build: pre-deploy HTML inline-script syntax guard

A missing brace in a home.html inline <script> caused an app-wide login
outage (the whole block failed to parse, so boot never ran). Nothing in the
deploy path checked HTML syntax. Add tools/check-syntax.js: parses (never
runs) every inline <script> in server/public/*.html with vm and exits non-zero
on any syntax error, reporting the file + line.

Wired in two places:
- Dockerfile RUN after COPY server/ ./ — a syntax error now FAILS the build,
  so it can't deploy.
- redeploy.sh pre-flight — fast local feedback before triggering the remote
  build.

Verified: passes on current pages (16 blocks / 9 files); fails with the exact
location when a brace is removed.

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

TECHSTACK.md

@@ -1,6 +1,6 @@
 # Tech Stack — BizGaze Connect
 
-> Living document. **Last updated: 2026-11-03** (rev 4). Update this file whenever a dependency, platform, service, or
+> Living document. **Last updated: 2026-11-03** (rev 5). Update this file whenever a dependency, platform, service, or
 > tool is added/removed/version-bumped. See [Maintaining this file](#maintaining-this-file) and the
 > [Changelog](#changelog) at the bottom.
 
@@ -203,6 +203,11 @@ Bump the **Last updated** date at the top and add a line to the Changelog below.
 
 ## Changelog
 
+- **2026-11-03 (rev 5)** — Reliability: Postgres pool safety timeouts (`connectionTimeoutMillis`,
+  `statement_timeout`, `idle_in_transaction_session_timeout`, max 10→20) so a saturated pool fails fast instead
+  of hanging forever; and a **pre-deploy HTML syntax guard** (`server/tools/check-syntax.js`) run in the Docker
+  build and `redeploy.sh` — a JS syntax error in an inline `<script>` now fails the build instead of reaching
+  production (it had caused an app-wide login hang).
 - **2026-11-03 (rev 4)** — Android native call **video** (Increment 2b): `CallVideo` renders camera/screen tiles
   with LiveKit `TextureViewRenderer` hole-punched behind a transparent WebView; `CallMedia` gains camera
   publish/flip + track lookup; new `ANDROID_NATIVE_VIDEO` server flag. Also fixed the white meeting background