When the Codex Responses API synthesizes an answer without emitting
url_citation annotations, previously-empty sources made cited results
look ungrounded. Add:
- tool_choice: { type: "web_search" } so Codex must call the tool
- markdown-link + bare-URL extraction from the answer as a fallback
that only runs when no structured citations were returned
The model-resolution path is unchanged; getBundledModels already
returns a usable Codex catalog on main.
Closes#724
- Extracted diagnostic target resolution logic into new `resolveDiagnosticTargets()` utility function with glob pattern support.
- Consolidated glob pattern detection and file matching logic by replacing conditional branches with unified utility call.
- Added file existence checking with stat before glob expansion to handle bracket paths as literal targets.
- Added test coverage for bracket path handling in diagnostic target resolution.
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