feat(F-139): completed feature

work/artifacts/F-139/implementer.md

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+# F-139 — Implementer evidence
+
+## What
+F-139 build evidence: fixed SSE streaming bug. tsc 0, verify.sh verde.
+
+## Files
+- `apps/admin/src/app/api/[...path]/route.ts` — proxy adds `X-Accel-Buffering: no`, uses `Headers` API, removes `Connection: keep-alive`.
+- `apps/admin/src/components/ServerLogViewer.tsx` — added exponential backoff reconnection loop (1s → 2s → 4s … max 30s); calls `reader.cancel()` on abort; resets backoff on success.
+
+## Verification
+- `npm run build` → 0 TypeScript errors.
+- `check-module-boundaries.mjs src` → 0 NEW violations.
+- `./scripts/verify.sh` → green (F-139 in_progress, runtime-consistent).
+
+## Root causes fixed
+| Cause | Fix |
+|-------|-----|
+| Proxy missing `X-Accel-Buffering: no` | Added header to proxy SSE response |
+| Client never reconnects | Exponential backoff retry loop in `connect()` |
+| Dead `LogBroadcaster.stream()` | No-op — never used by SSE endpoint |