fix(v0.5.12.1): hotfix consumer.py missing 'import time'

URGENT live-flip hotfix. Bug: v0.5.9 GAMMA universal freshness gate added time.time() calls to meshai/central/consumer.py without importing time. v0.5.10 nws/quake/swpc dispatch path inherited the same bug. v0.5.11 + v0.5.12 builds inherit it too. The module only imported `datetime`, not `time`.

Result during the live flip: EVERY Central event hit NameError: name 'time' is not defined at consumer.py line 454 inside the v0.5.9 GAMMA freshness check. The try/except inside _normalize() swallowed the exception, returning None synthesized for every event. 33 minutes of master=ON resulted in 0 broadcasts AND 0 persistence rows -- the right outcome (no spam) but via the wrong mechanism (crash on every event).

How it slipped through: the v0.5.9 GAMMA patch script extended consumer.py with time.time() calls but didn't audit the existing imports. The test suite (718 passing) didn't catch it because the tests for the freshness helper run against central_normalizer (which DOES import time) -- the consumer.py path is never exercised by the unit tests. Live flip discovered it on first envelope arrival.

Fix: one-line addition of 'import time' to consumer.py top-imports block. py_compile clean, 718 tests still pass. Container will be rebuilt + restarted with master remaining ON.

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

meshai/central/consumer.py

@@ -14,6 +14,7 @@ Wire format (see Central CONSUMER-INTEGRATION guide, confirmed in v0.4 Phase A):
 import json
 import logging
 import re
+import time
 from datetime import datetime
 from typing import Optional