perf: light PostToolUse hook (perf subset of ac2a001) [follow-up #31]#32
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…lter, lock-safe append [follow-up #31] - Add _NOISE_TOOLS frozenset for O(1) skip of high-frequency no-signal tools (TodoRead/Write, WebSearch/Fetch, smem_recall/session/stats/index, preview logs) before any config file I/O — fastest possible exit path - Replace lazy `from surreal_memory.utils.timeutils import utcnow` with inline stdlib datetime.now(UTC) in _format_event — zero non-stdlib imports on hot path - Merge two separate config.toml reads (_is_enabled + _get_blacklist) into one _read_tool_memory_config call per invocation - Lock-safe JSONL append via fcntl.flock(LOCK_EX) on POSIX; plain append fallback on platforms without fcntl (Windows) - Handle CODEX_SESSION_ID as fallback when CLAUDE_SESSION_ID is absent - Extract _get_data_dir() helper; _get_session_id() as testable function - Tests: 48 tests covering _NOISE_TOOLS, _utcnow_iso, _get_session_id (CLAUDE+CODEX), single-config-read API, concurrent append JSONL validity, noise fast-path
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Follow-up to merged #31. light PostToolUse hook (perf subset of ac2a001). Local make verify green. See .goal/runs/002-followup-port-2026-06.