* feat: complete offline mode support for local-only model setups
- Add isLocalModel() to detect localhost/127.0.0.1/0.0.0.0/::1/unix sockets
- Add isAllLocalChain() to verify all registry models are local
- Validate --offline flag rejects remote models with clear error
- Auto-enable PI_OFFLINE when all configured models are local
- Return dummy API key for local models to skip auth validation
- Filter web search results in offline mode (chat-controller + tool-execution)
- Add ECONNREFUSED/ENOTFOUND/ENETUNREACH to INFRA_ERROR_CODES for immediate
failure (no retry) when network is intentionally unavailable
- Add comprehensive test suite (17 tests)
Fixes#2341
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix(test): update infra-error test for new offline-mode error codes
The offline mode feature added ECONNREFUSED, ENOTFOUND, and ENETUNREACH
to INFRA_ERROR_CODES but the test still asserted size === 6. Update the
count to 9 and add detection tests for the three new codes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
