# Changelog

## v3.12.0 — 2026-04-25

### Features

- **Streaming heartbeat** — opt-in SSE comment frame (`: keepalive\n\n`) emitted during silent windows on the streaming response. Controlled by `CLAUDE_HEARTBEAT_INTERVAL` env var (ms; `0` = disabled, default). Covers both pre-first-byte and mid-stream tool-use pauses. Addresses #47. See [design doc](docs/superpowers/specs/2026-04-25-47-sse-heartbeat-design.md).
- **`X-Accel-Buffering: no`** response header added to SSE responses so heartbeats survive nginx/Cloudflare default buffering.

### Behavior changes

- SSE headers are now sent immediately after the claude CLI spawns successfully, not on first stdout byte. The rare "spawn succeeded but subprocess died before any byte" path now closes the SSE stream cleanly rather than returning a JSON error.

### Config additions

| Variable | Default | Description |
|---|---|---|
| `CLAUDE_HEARTBEAT_INTERVAL` | `0` (disabled) | Interval in ms for SSE keepalive comment frames on streaming path. Resets on every real frame. |

## v3.11.1 — 2026-04-21

### Fixes
- Concurrency slot leak on subprocess timeout (#37). The request-timeout handler called `proc.kill("SIGTERM")` without decrementing `stats.activeRequests`. A subprocess stuck in a syscall that ignored SIGTERM would hold its slot until (or beyond) the 5s SIGKILL escalation actually reaped it. Slot release is now wired to `proc.once("exit", cleanup)` so every termination path — normal close, error, SIGTERM, SIGKILL — releases the slot exactly once.

## v3.11.0 — 2026-04-20

### Features
- `ocp update` now automatically syncs OpenClaw's registry with the latest models (scripts/sync-openclaw.mjs)
- Server logs warn if OpenClaw registry drifts from models.json

### Refactor
- models.json is now the single source of truth for model list
- server.mjs and setup.mjs derive MODEL_MAP/MODELS from models.json
- Adding a new model is now a one-file edit

### Fixes
- OpenClaw's model dropdown now shows all 4 current models (opus-4-7, opus-4-6, sonnet-4-6, haiku-4.5) on existing installs after `ocp update`. Previously setup.mjs only wrote the registry at install time.