feat: make sse ping/replay configurable via config

feat: add sse heartbeat ping

feat: rowid cursor

feat: unify sse replay/live as EventRecord with sse ids

feat: sse replay support with initial backlog

feat: add sse event stream via broadcast bus

docs: improve mcp tool schemas and add openclaw integration guide

feat: add api token auth and mcp content blocks

feat: add minimal mcp server over stdio

feat: add db-backed event filtering (since/label/type/subject)

feat: add read-only http api for targets and events

feat: add tracing, isolate errors per target and notifier

feat: add cooldown policy with notify_log

feat: add branch/npm providers and composite watch provider

feat: add config.yaml and polling loop with once/dry-run