Agent/global codex hooks - #23
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Adds the supervision kernel that will guarantee exactly one healthy long-lived collector process per data root. Primitives only — nothing in the hook, the CLI, or the server calls them yet, so event delivery is unchanged. - observe-env.sh: data-root and runtime path resolution, unsafe-root rejection, shared config defaults. Resolution is side-effect free so read-only callers never create state. - observe-process.sh: process identity (PID + start time + executable) plus a stable entrypoint marker, so a reused PID or an unrelated live process is never mistaken for the collector. Signals are addressed by identity, never by pattern. - observe-lock.sh: atomic lock claims and identity-based abandonment. Age is never evidence that a lock is abandoned. - observe-heartbeat.sh: heartbeat age/freshness bound to the lock's instanceId, and the canonical health predicate. - observe-health.sh: read-only diagnostic with four output shapes and three exit codes. It never signals, reclaims, or creates anything. Lock claims are gated in two stages: mkdir for the directory, then an O_EXCL (noclobber) write of the pid file inside bash. The second stage is load-bearing — Ubuntu 25.10's uutils coreutils 0.8.0 mkdir reports success to several concurrent creators of the same directory, so a singleton resting on the host mkdir binary is not a guarantee. The race test in test/hooks/scripts/supervision covers this. Contract and invariants: docs/collector-supervision.md Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
… supervision vars/tests
feat(supervision): add collector supervision primitives
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