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* fix(config): close out #4124 review follow-ups Extracts the (mtime, size, sha256) content-signature helper that was duplicated between config/app_config.py and mcp/cache.py into a new config/file_signature.py, and fixes ExtensionsConfig.resolve_config_path() to return None instead of raising FileNotFoundError when an explicit config_path argument or DEER_FLOW_EXTENSIONS_CONFIG_PATH points at a file that has since been deleted -- the exact resolution mode Docker dev/prod uses per AGENTS.md, so the MCP tools-cache staleness check could raise instead of degrading to "not stale". Both were flagged by willem-bd in review on #4124 and explicitly deferred there ("flagging for visibility", "leaving the extraction as the follow-up you suggested"). * fix(config): keep explicit extensions-config paths fail-loud resolve_config_path() previously turned every missing-file case into a clean None, including an explicit config_path argument or DEER_FLOW_EXTENSIONS_CONFIG_PATH (the exact mode Docker dev/prod uses). That silently downgrades a bad Docker mount, typo, or deleted production config to "no extensions" instead of surfacing the misconfiguration, per fancyboi999's review [P1] and willem-bd's follow-up notes on this PR. Restores FileNotFoundError for the two explicit modes (config_path argument, DEER_FLOW_EXTENSIONS_CONFIG_PATH); only the fallback search mode (no explicit path/env var, nothing found in the usual locations) still returns None, since that is the legitimate "extensions were never configured" case. The one caller that needs the old fail-soft behavior -- the MCP tools-cache staleness check, which re-resolves the path on every get_cached_mcp_tools() call -- gets a narrow, local catch instead (deerflow.mcp.cache._resolve_config_path) so a config file going missing mid-run still degrades the cache to "not stale" rather than crashing a hot per-request path. Also hoists the double os.getenv() read in the env-var branch into a local, per willem-bd's nit. Adds resolver-level tests for both explicit-path and env-var raises, a dedicated search-mode None regression test, and updates the existing MCP-cache docstrings to describe the corrected split.