Return range coordinates for review comments

[yiheng-kkk]

Summary

Returns the start and original line coordinates for pull request review comments, including multi-line and outdated comments.

Why

Without these fields, a comment spanning lines 73–86 is reported only as a comment on line 86.

Fixes #3190

What changed

• request originalLine, startLine, and originalStartLine in the review-thread query
• include the nullable coordinates in the minimal response
• cover multi-line, single-line, and current-line-unavailable comments

MCP impact

• No tool or API changes
• Tool schema or behavior changed
• New tool added

The successful get_review_comments response now includes three optional coordinate fields.

Prompts tested (tool changes only)

• Not run through an interactive client; Test_GetPullRequestComments covers the GraphQL-to-MCP response path.

Security / limits

• No security or limits impact
• Auth / permissions considered
• Data exposure, filtering, or token/size limits considered

The fields are three nullable integers from the same authorized review comment object and require no extra request.

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

Lint & tests

• Linted locally with ./script/lint
• Tested locally with ./script/test

Also ran UPDATE_TOOLSNAPS=true go test ./...; no snapshot changes were needed.

Docs

• Not needed
• Updated (README / docs / examples)

Generated docs are unchanged because the input tool schema is unchanged.

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