feat: preview module definitions in tag completions

[ViTeXFTW]

Summary

• show the defining module header as Markdown documentation for RemoveModule/ReplaceModule tag completions
• preserve module preview metadata across workspace indexing and inherited default tags
• add analysis, conversion, and end-to-end coverage

Validation

• cargo test
• python crates/server/tests/e2e.py target/debug/zerosyntax-lsp.exe

[greptile-apps]

Greptile Summary

This PR adds Markdown module-definition previews to RemoveModule and ReplaceModule tag completions.

• Preserves module preview metadata through workspace indexing and inherited default tags.
• Converts preview text into LSP Markdown completion documentation.
• Bumps the persistent cache producer ABI for the serialized index shape change.
• Adds analysis, conversion, and end-to-end coverage.

Confidence Score: 5/5

The PR appears safe to merge with no outstanding findings.

The previous cache-compatibility finding was fixed by changing the producer ABI from v2 to v3, so stale payloads using the old serialized shape are no longer selected; the thread was also manually resolved.

Important Files Changed

Filename	Overview
crates/analysis/src/completion.rs	Adds optional completion documentation and populates it with defining module headers for effective module tags.
crates/analysis/src/index.rs	Indexes module-header snippets and carries them through effective module tag lookup, including inherited defaults.
crates/server/src/cache.rs	Bumps the cache producer ABI to prevent selection of payloads serialized with the previous ModuleTagDefinition shape.
crates/server/src/convert.rs	Converts analysis completion documentation into LSP Markdown markup.
crates/server/tests/e2e.py	Verifies that RemoveModule completions expose the defining module as Markdown documentation.

_{Reviews (2): Last reviewed commit: "fix: bump workspace cache producer ABI" | Re-trigger Greptile}

[ViTeXFTW]

@greptileai

[greptile-apps]

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