- Extended short-form diff URL parsing to treat `<scheme>://N/diff` as a diff path across schemes, so `issue://N/diff` now follows the issue no-diff rejection path.
- Kept repository listing behavior unchanged for `<scheme>://owner/diff` by limiting diff short-form disambiguation to numeric hosts.
- Added regression coverage asserting `issue://9/diff`, `issue://9/diff/all`, and `issue://9/diff/3` now reject with the issue no-diff error.
- Fixed `issue://owner/diff` and `pr://owner/diff` parsing so they resolve to issue and PR list outputs.
- Fixed `pr` short-form parsing by requiring `scheme==='pr'` and a numeric host before `diff` matching.
- Fixed PR unified-diff parsing to decode quoted header paths and count `----`/`++++` hunk lines as one deletion/addition.
- Fixed `read` error rendering to emit status blocks with cleaned, range-aware, tab-normalized lines.
- Stopped `github-cache` from chmod-ing existing parent directories, preserving pre-existing permission modes.
- 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.
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