fix(registry): point nx 22.7+ at astro-docs and index .mdoc files

[moshest]

Summary

publish-all --since 2 failed on npm/nx@22.7.2 with Directory not found: /tmp/context-git-…/docs. Nx 22.7.0 deleted the top-level docs/ directory and migrated all documentation into astro-docs/src/content/docs/ as Markdoc (.mdoc) files (Astro Starlight site).

• registry/npm/nx.yaml — split into two version ranges: 22.7.0+ → astro-docs/src/content/docs, 17.0.0 – <22.7.0 → docs (preserves the path already-published older versions used).
• packages/context/src/git.ts — add .mdoc to DOCUMENTATION_EXTENSIONS; previously .mdoc files were silently skipped, so even the right docs_path would have produced zero files.
• packages/context/src/build.ts — extend parseMarkdown's title-stripping regex to handle .mdoc filenames.
• .changeset/mdoc-extension-support.md — patch bump for @neuledge/context.

Test plan

• node packages/registry/dist/cli.js build nx 22.7.2 → Built (1901 sections, 575936 tokens)
• Version-range resolution: 17.0.0 / 21.0.0 / 22.6.5 → docs; 22.7.0 / 22.7.2 / 23.0.0 → astro-docs/src/content/docs
• pnpm lint passes
• pnpm test passes (157 context + 37 registry tests)

https://claude.ai/code/session_012qtew8ebkKeL7T6gaGGcTv

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Generated by Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: c32f996

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@neuledge/context	Patch
@neuledge/registry	Patch

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