v3.0.0: ThreadingHTTPServer, dynamic ports, health gating, atomic config, safe cleanup, buffered SSE, batched stats, graceful shutdown

CHANGELOG.md

@@ -1,5 +1,34 @@
 # Changelog
 
+## v3.0.0 (2026-05-20)
+
+**Major architectural overhaul — Phase 0 + Phase 1 of engineering roadmap**
+
+### Proxy (translate-proxy.py)
+- **ThreadingHTTPServer** — serves concurrent requests (no more blocking)
+- **Thread-safe shared state** — OrderedDict response store with locks, Crof state lock, stats lock
+- **Batched + atomic stats writes** — stats buffered in memory, flushed every 5s via `os.replace()`
+- **Graceful shutdown** — SIGTERM/SIGINT drain active connections (up to 5s), reject new with 503
+- **Progressive upstream timeouts** — based on input size and tools (60-300s instead of flat 180s)
+- **Lazy JSON parsing** — skip parsing SSE events unless they contain `response.completed`
+- **Buffered SSE writes** — flush every 30ms, on urgent events, or at 4KB (reduces syscalls)
+- **`/health` endpoint** — returns backend, target, models, BGP route count
+- **Consolidated imports** — all at top, no more missing import crashes
+- **`main()` entry point** — runtime init moved out of module level
+- **TCP_NODELAY** — on all streaming paths (from v2.7.0)
+- **Anthropic prompt caching** — `cache_control: ephemeral` on system prompts (from v2.7.0)
+
+### Launcher (codex-launcher-gui)
+- **Dynamic port allocation** — `_pick_free_port()` picks random free port, no more 8080 conflicts
+- **Proxy health gating** — Codex will NOT launch if proxy fails health check within 15s
+- **Error dialogs** — clear GTK error dialog when proxy startup fails
+- **Atomic config backup/restore** — temp file + `os.replace()`, no more corrupted config.toml
+- **Config transactions** — recovery from interrupted sessions on next startup
+- **Safe cleanup (PID registry)** — only kills processes launched by the app (pids.json)
+- **Proxy stderr piped to log** — real-time proxy logs in launcher UI
+- **Bearer token** — Codex config uses `codex-launcher-local` instead of real API key
+- **Usage Dashboard v2** — OpenUsage-inspired dark theme with status pills, KPI strip, model bars (from v2.7.0)
+
 ## v2.7.0 (2026-05-20)
 
 - **Usage Dashboard redesigned** (inspired by OpenUsage design patterns)