- Added issue:// and pr:// URL handlers for single lookups and list queries with query filters.
- Added a SQLite-backed GitHub cache with soft/hard TTLs, stale hits, and background stale refresh.
- Removed issue_view and pr_view tool operations, inputs, and docs, requiring reads via issue:// and pr:// URLs.
- Added github-cache and issue-pr-protocol tests with temporary cache DB setup and OMP_GITHUB_CACHE_DB teardown.
- Switched issue and PR search handlers to `gh api /search/issues` with `is:issue`/`is:pr` queries.
- Added REST search response models and mapped issue/code/commit/repo payloads to normalized results.
- Updated code, commit, and repo search parsing to read `{items}` envelopes and convert snake_case fields.
- Fixed merged-PR output state by deriving it from `pull_request.merged_at` in test fixtures.
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