docs: update for codebase consolidation and startup fixes

- Remove source.py from architecture (deleted)
- Add metrics.py to module list
- Update warm start: trusts cached state, instant startup
- Update signal handling: registered before startup
- Add refactoring tasks to TASKS.md
- Remove stale troubleshooting entry

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TASKS.md

@@ -23,7 +23,7 @@
 - [x] Per-proxy backoff (60s cooldown after connection failure)
 - [x] Stale proxy expiry (evict dead proxies not seen for 3 refresh cycles)
 - [x] Pool stats in periodic metrics log (`pool=alive/total`)
-- [x] Fast warm start (quick-test alive subset, defer full test)
+- [x] Fast warm start (trust cached state, defer all health tests)
 - [x] Static chain health check (skip pool tests if chain unreachable)
 - [x] SIGHUP hot config reload (timeout, retries, log_level, pool config)
 - [x] Dead proxy reporting (`report_url` POST evicted proxies to API)
@@ -31,6 +31,18 @@
 - [x] Async HTTP client (replace blocking urllib, parallel source fetch)
 - [x] First-hop TCP connection pool (`pool_size`, `pool_max_idle`)
 
+- [x] Codebase consolidation (refactor/codebase-consolidation)
+  - [x] Extract shared proxy parsing and constants to config.py
+  - [x] Consolidate health-check HTTP logic in pool
+  - [x] Remove threading from metrics (pure asyncio, no lock needed)
+  - [x] Replace `ensure_future` with `create_task`
+  - [x] Rename ambiguous variables in config loader
+  - [x] Remove legacy ProxySource layer (source.py deleted)
+  - [x] Add tests for extracted `parse_api_proxies`
+- [x] Instant warm start (trust cached state, defer all health tests)
+- [x] Register signal handlers before startup (fix SIGKILL on stop)
+- [x] Use k8s-file logging driver with rotation
+
 ## Next
 - [ ] Integration tests with mock proxy server
 - [ ] SOCKS5 server-side authentication