v0.4.1 — Incremental memory ingestion

Highlights

Incremental memory ingestion. The MetaClaw memory layer no longer waits until session end to extract and persist turns. Instead, turns
are buffered and flushed every N turns (default 5), shrinking the mid-session blackout window and eliminating the O(N²) cost of
re-sending full history on every agent turn.

What's new

Memory layer (metaclaw/memory/manager.py)

• New buffer_turn(session_id, turn, scope_id=None) — buffers a single turn, auto-flushes when flush_every is reached.
• New flush_session(session_id, scope_id=None, final=True) — flushes buffered turns; only emits the working-summary unit and clears
  per-session state when final=True.
• ingest_session_turns refactored into shared helpers (_extract_turns_to_units, _build_working_summary_unit, _persist_units).
• Per-session state persists across flush boundaries; absolute turn indices preserved via a turn_offset parameter.

Config

• metaclaw/config.py gains memory_flush_every (default 5).
• Sidecar SidecarConfig forwards the same value.

Sidecar HTTP (openclaw-metaclaw-memory/sidecar)

• New POST /buffer_turn — returns {flushed, added}.
• New POST /flush_session — returns {added}.
• Proxy now routes /v1/memory/buffer_turn and /v1/memory/flush_session.

OpenClaw plugin (openclaw-metaclaw-memory/src)

• client.ts adds bufferTurn and flushSession.
• types.ts adds BufferTurnResponse and FlushSessionResponse.
• hooks/auto-capture.ts rewritten: tracks per-session turn count in a module-level Map, so agent_end only forwards the new delta via
  bufferTurn. session_end calls flushSession(final=true) and drops the tracker.

Upgrade notes

• No migration required — the legacy /ingest endpoint and ingest_session_turns API are unchanged.
• To opt in from the plugin, rebuild openclaw-metaclaw-memory (npm run build) and redeploy.
• Tune memory_flush_every via SidecarConfig.flush_every if you want a different flush cadence.