Each per-source lifter holds its own RuleIndex and exposes an
`async watch_store()` that loads the corpus and drains store change
events forever. Until this commit nothing called `watch_store()` in
production — every dispatch index stayed empty and no rule fired.
- Add `WatchableTagger` runtime-checkable Protocol in `decnet.ttp.base`.
- `CompositeTagger.iter_watchables()` yields lifters that satisfy it.
- `run_ttp_worker_loop` fans out one task per watchable, cancelled
and awaited alongside pump/heartbeat/control in the existing finally.
- Watch failures log and exit the watch task without taking the
worker down — mirrors the pump-task tolerance contract.
Inner loop drains a per-process asyncio.Queue populated by one pump
task per topic in _TOPICS, dispatches each event through
CompositeTagger, persists via repo.insert_tags(), and publishes
ttp.tagged + per-technique ttp.rule.fired.<id> only when the insert
returned a non-zero rowcount.
CompositeTagger seeded with all six lifters (Behavioral, Intel,
CanaryFingerprint, Email, Identity, Credential).
Loop-prevention invariant from TTP_TAGGING.md §"Bus topics" enforced:
N replays of the same upstream event publish exactly one ttp.tagged
event. test_worker_bus covers both the direct invocation path and
the idempotency replay path.
Intel catch-up via attacker.session.ended is intentionally deferred
to E.3.14b — needs a session→intel join the repo doesn't expose yet.
