v0.5.0 — local context substrate + memory loop

Added

• pmctl context index/update/query — SQLite-backed repo index for file and symbol retrieval before dispatch
• pmctl context pack / reuse-scan — assemble context hits into a pack or scan for prior art before writing a brief
• pmctl task claim/dispatch/status/review — full task lifecycle FSM with durable state records
• pmctl safe bash — runs a bash command only after it passes the guard check
• pmctl validate — validates a handover brief from the CLI
• /discover — scans backlog + milestones, ranks opportunities by (impact × timeliness) / size
• mem-distill reads the anomaly slice of the event log (failed runs, denied writes) to find recurring patterns worth recording

Changed

• Brief authoring now requires a pmctl context reuse-scan prior-art pass before writing
• Executor agents now do fail-fast brief validation as their very first action

Removed

• Routing-log and tool-trace hooks retired — events.jsonl trace store is the single sink
• pmctl guard check --profile deprecated alias removed (use --role + --runtime)
• codex-dispatch.sh compatibility wrapper removed

Full details: CHANGELOG.md § 0.5.0