feat(repos): add typed commit tool outputs

[SamMorrowDrums]

Summary

Migrates get_commit and list_commits to concrete typed MCP inputs and outputs, including full, field-projected, and empty commit lists. Modern clients receive schema-conformant structured output; legacy JSON text remains byte-exact.

Why

Continues the staged all-tools typed output migration for repository tools, building on discussion/notification PR #3388.
Fixes #

What changed

• Added concrete commit input DTOs, MinimalCommit output for get_commit, and optional-field ListCommitOutput DTOs and selector for list_commits.
• Restored original pagination defaults: omitted, explicit numeric zero, and string zero resolve to page=1 and perPage=30 for both tools, with exact REST query assertions for direct handlers and both protocol versions.
• Preserved advertised input schemas, legacy text serialization, projections, sanitization, permissions, and IFC labels.
• Added modern/legacy protocol and schema-conformance coverage for full lists, fields=[sha], nested fields=[commit], and empty full/projected lists, with byte-exact legacy text assertions.

MCP impact

• No tool or API changes
• Tool schema or behavior changed
  Modern clients receive output schemas and structured content for full, projected, and empty results. Legacy clients retain unchanged text bytes and input schemas; numeric/string zero pagination retains the original defaults.
• New tool added

Prompts tested (tool changes only)

• "Get commit details for abc123 in owner/repo" - equivalent mocked tool calls validated typed output and byte-exact legacy text.
• "List commits in owner/repo and return only the SHA" - equivalent mocked tool calls validated projected structured output and legacy text.
• "List commits and return the nested commit metadata" - equivalent mocked tool calls validated fields=[commit] and schema conformance.
• "List commits using page zero and perPage zero" - equivalent mocked tool calls validated numeric/string-zero defaults and exact GitHub query parameters.

Security / limits

• No security or limits impact
• Auth / permissions considered
  Existing repository read scope and commit-content IFC labeling are retained.
• Data exposure, filtering, or token/size limits considered
  Structured output honors the same field selection as legacy text, including nested commit fields; projected calls do not expose unselected fields.

Tool renaming

• I am renaming tools as part of this PR (e.g. a part of a consolidation effort)
  • I have added the new tool aliases in deprecated_tool_aliases.go
• I am not renaming tools as part of this PR

Note: if you're renaming tools, you must add the tool aliases. For more information on how to do so, please refer to the official docs.

Lint & tests

• Linted locally with ./script/lint
script/lint passed with 0 issues on final head 4b6686b5fc361a702e50d7e37a55870e49da6900.
• Tested locally with ./script/test
script/test passed all packages with race detection on the same final head.

Additional final-head validation:

• go test ./pkg/github -run 'TestTypedRepositoryCommit|Test_GetCommit|Test_ListCommits' -count=1 - passed.
• script/generate-docs - passed; generated documentation unchanged.
• git diff --check - passed.

Docs

• Not needed
  Tool names, descriptions, and advertised input schemas are unchanged; generated documentation and existing toolsnaps require no changes.
• Updated (README / docs / examples)

[Copilot]

Copilot review overview

🟡 Changes recommended

The generated Linux license report contains an inconsistent architecture-specific license path.

Review effort: Balanced
Findings: 1

Open (1)

• Fix inconsistent license path in 386 dependency report · New

What changed in this PR

Migrates repository commit tools to typed MCP inputs and outputs while preserving legacy text responses and pagination defaults.

Changes:

• Adds typed outputs and field projection for commit tools.
• Adds protocol, schema, projection, and pagination tests.
• Updates shared argument normalization and a generated license report.

File	Description
pkg/​github/​repositories.go	Implements typed commit inputs and outputs.
pkg/​github/​typed_read_normalizers.go	Adjusts pagination normalization.
pkg/​github/​typed_repository_commit_outputs_test.go	Tests typed and legacy commit behavior.
third-party-licenses.linux.md	Splits Linux architecture license listings.

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