Bug: main() called both enforce_fetch_interval() and mark_fetch(), which
both now call check_and_reserve(). On cold start:
1. enforce_fetch_interval() → check_and_reserve() → SUCCESS (reserves)
2. mark_fetch() → check_and_reserve() → FAILS (cooldown now active)
This prevented HTTP from ever being called on cold start.
Fix:
- Removed duplicate calls to enforce_fetch_interval() and mark_fetch()
- Single check_and_reserve() call before fetch_html()
- enforce_fetch_interval() and mark_fetch() remain as legacy wrappers
Verification:
- All 18 community_cli tests pass
- Code analysis confirms single check_and_reserve() call in main()
- check_and_reserve() is atomic with exclusive lock for check+reserve
ik
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