feat(daemon): loop body wires executeIntent end-to-end (claim → dispatch → heartbeat) (#107)

Stacked on #106. Replaces the injected-executor abstraction in daemon/loop.ts
with a direct call to meta/intent.ts::executeIntent, closing the
meta-orchestrator loop. Status transitions, audit-row writes, and the second
sovereignty gate are all owned by executeIntent → dispatch; the loop's
responsibility is leader lifecycle, intent claiming, heartbeats, and outcome
classification.

Four outcomes are handled distinctly:

  - ok=true (executed)      → bump processed counter, reset error backoff
  - ok=true (replayed)      → bump replayed counter, no backoff, no double-count
  - ok=false (refused)      → bump refused counter, no backoff (steady-state)
  - ok=false (exec error)   → bump errored counter, bounded exp backoff

Sovereignty refusals are identified by canonical error prefixes emitted by
meta/executors/dispatch.ts ("sovereignty re-reckon:" /
"sovereignty snapshot stale ..."). Refusals are NOT treated as transient
faults — they are valid outcomes and do not trigger backoff.

The loop honors options.signal via AbortController throughout, including
inside the sleep helper, so SIGTERM from daemon/runtime/entrypoint.ts (PR #105)
unwinds cleanly through releaseLeadership.

tests/daemon/loop.spec.ts — real Neon integration. Seeds two pending intents
against the update_obligation_status executor, runs runLeaderLoop with
maxIntents=2, asserts:
  - both intents reach status='done'
  - each produces exactly one cc_actions_log row (attempt=1, key set, status='completed')
  - cc_obligations rows actually moved to 'deferred'
  - cc_node_leases shows leadership released on clean exit
  - log stream contains intent_heartbeat_before / intent_heartbeat_after pairs

Out of scope (not in this PR):
  - new executors (mercury, etc.)
  - production deploy
  - multi-node coordination beyond single-node leader
  - schema additions on cc_intents / cc_actions_log

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: chitcommit