fix(copyllm): expand table components in markdown endpoint

[jd]

The "Copy for LLM" and "View as Markdown" features served raw MDX source,
which included unresolved JSX component tags like
<OptionsTable def="PullRequestRuleModel" /> instead of actual table data.

This adds a processing step that replaces OptionsTable, ActionOptionsTable,
and PullRequestAttributesTable components with markdown tables generated
from the config schema, and strips import statements.

Fixes Mergifyio/mergify#5166

Co-Authored-By: Claude Opus 4.6 (1M context) [email protected]

[mergify]

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[Copilot]

Pull request overview

This PR fixes the “Copy for LLM” / “View as Markdown” output by post-processing raw MDX source so that schema-driven table components are expanded into real markdown tables (and MDX import lines are removed), producing more usable plain markdown from the .md endpoint.

Changes:

• Added a schemaToMarkdown utility that expands <OptionsTable />, <ActionOptionsTable />, and <PullRequestAttributesTable /> into markdown tables generated from the config schema.
• Added Vitest coverage for MDX expansion behaviors (table replacement, import stripping, blank-line normalization).
• Wired the markdown endpoint (src/pages/[...slug].md.ts) to run the MDX expansion step before returning the response.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/util/schemaToMarkdown.ts	Implements MDX-to-markdown transformations and schema-to-table generation.
src/util/schemaToMarkdown.test.ts	Adds unit tests validating the expansion and cleanup behaviors.
src/pages/[...slug].md.ts	Applies the expansion step to the .md endpoint response.

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-04-14 10:48 UTC · Rule: default
• ✅ Checks passed · on draft merge queue: embarking main (d3fbe2b) and #11040 together #11044
• ✅ Merged — 2026-04-14 10:51 UTC · at 2f89f06e02378e7339201b96dba24a3867210366

This pull request spent 2 minutes 58 seconds in the queue, including 2 minutes 20 seconds running CI.

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