docs: add missing .md extensions to six cross-reference links

[ZayanKhan-12]

Six cross-references in docs/reference/policy-engine.md (5) and docs/hooks/reference.md (1) link other doc pages extensionless — four also with site-absolute /docs/... paths — e.g. ](/docs/reference/tools#available-tools) and ](../reference/tools). On GitHub's rendered view these 404 (docs/reference/tools has no extensionless file). The other 57 cross-references in the same directories consistently use relative .md links, and both targets (docs/reference/tools.md, docs/tools/shell.md) exist — so this normalizes the stragglers to the dominant convention. Anchors preserved.

Docs only; no code changes.

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses broken cross-reference links within the documentation. By appending the necessary .md extensions and standardizing path formats, it ensures that users can correctly navigate between related documentation pages without encountering broken links.

Highlights

• Documentation Fixes: Corrected six cross-reference links in the documentation by adding missing .md file extensions to ensure proper navigation and prevent 404 errors.
• Path Normalization: Updated absolute site paths to relative paths to maintain consistency with the existing documentation structure.

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[github-actions]

📊 PR Size: size/S

• Lines changed: 12
• Additions: +6
• Deletions: -6
• Files changed: 2

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[gemini-code-assist]

Code Review

This pull request updates several internal documentation links in docs/hooks/reference.md and docs/reference/policy-engine.md to use correct relative paths with .md extensions instead of absolute or extensionless paths. There are no review comments, and I have no feedback to provide.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[ZayanKhan-12]

@googlebot I signed it!