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A1 of the wake canon (EPIC #892). A per-host, single-instance, long-lived detector SERVICE (not a timer) that generalizes the proven delta-gated poller and enqueues observed deltas into the merged W2 durable store. - §1.1 placement: per-host single-instance (non-blocking flock; a 2nd instance refuses), serves local panes only, no cross-host waking. A long-lived service, not a timer. Generalizes the poll->hash->deliver-only-on-delta exemplar and adds (a) repo-section/anchor-scoped hashing so human-decision FILE edits are caught, not just API-visible state. - §1.2 observe->store: on a delta, assign the next observed_seq and enqueue to store.sh with {class, locators, emit_ts} via its public API (store not reimplemented). - §2.4 cursor semantics: detector-local observed_seq is a monotonic int assigned AT OBSERVATION and authoritative; source SHAs are descriptors. A per-watch last-observed hash is compared each poll so a revert (A->B->A) is caught. - §4/G2a fail-loud source semantics: a source error / 401 / 403 / privacy-404 / partial / ambiguous-empty response fails loud, does NOT advance observed_seq, and is NEVER treated as "no change". - Gate B (#869): the watch-list schema_version is validated against the manifest [schema_min, schema_max]; out of range => rejected (fail loud), never coerced. RED-first harness (test-wake-detector.sh), wired into test:framework-shell: no-change->no enqueue; change->exactly one enqueue with a fresh observed_seq; revert A->B->A caught; single-instance flock; schema out-of-range fail-loud; source error/ambiguous-empty fail-loud with observed_seq not advanced; anchor-scoped hashing (outside-anchor edit = no-op, inside-anchor edit = delta). Fake/stub sources only (no live network); shellcheck clean; operator-agnostic. Part of #892 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0158NZqN2n2ymKFeJAZ4GUCb