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* feat: add project cooldown log to prevent rapid observer re-spawn Adds session-guardian.sh, called by observer-loop.sh before each Haiku spawn. It reads ~/.claude/observer-last-run.log and blocks the cycle if the same project was observed within OBSERVER_INTERVAL_SECONDS (default 300s). Prevents self-referential loops where a spawned session triggers observe.sh, which signals the observer before the cooldown has elapsed. Uses a mkdir-based lock for safe concurrent access across multiple simultaneously-observed projects. Log entries use tab-delimited format to handle paths containing spaces. Fails open on lock contention. Config: OBSERVER_INTERVAL_SECONDS default: 300 OBSERVER_LAST_RUN_LOG default: ~/.claude/observer-last-run.log No external dependencies. Works on macOS, Linux, Windows (Git Bash/MSYS2). * feat: extend session-guardian with time window and idle detection gates Adds Gate 1 (active hours check) and Gate 3 (system idle detection) to session-guardian.sh, building on the per-project cooldown log from PR 1. Gate 1 — Time Window: - OBSERVER_ACTIVE_HOURS_START/END (default 800–2300 local time) - Uses date +%k%M with 10# prefix to avoid octal crash at midnight - Toolless on all platforms; set both vars to 0 to disable Gate 3 — Idle Detection: - macOS: ioreg + awk (built-in, no deps) - Linux: xprintidle if available, else fail open - Windows (Git Bash/MSYS2): PowerShell GetLastInputInfo via Add-Type - Unknown/headless: always returns 0 (fail open) - OBSERVER_MAX_IDLE_SECONDS=0 disables gate Fixes in this commit: - 10# base-10 prefix prevents octal arithmetic crash on midnight minutes containing digits 8 or 9 (e.g. 00:08 = "008" is invalid octal) - PowerShell output piped through tr -d '\r' to strip Windows CRLF; also uses [long] cast to avoid TickCount 32-bit overflow after 24 days - mktemp now uses log file directory instead of TMPDIR to ensure same-filesystem mv on Linux (atomic rename instead of copy+unlink) - mkdir -p failure exits 0 (fail open) rather than crashing under set -e - Numeric validation on last_spawn prevents arithmetic error on corrupt log Gate execution order: 1 (time, ~0ms) → 2 (cooldown, ~1ms) → 3 (idle, ~50ms) * fix: harden session guardian gates --------- Co-authored-by: Affaan Mustafa <affaan@dcube.ai>