feat(llms-txt): write each page's Markdown and llms-full.txt

[ovflowd]

Description

This PR adds two opt-in options to the llms-txt generator:

• writeMarkdown: writes the Markdown of every page at {path}.md, which is where llms.txt links by default (pageURL: '{baseURL}{path}.md'), so those links resolve without a separate copy step.
• writeFull: writes llms-full.txt with every page, each preceded by its URL. It's the same format VitePress' llms plugin produces.

Pages are rebuilt from the metadata entries' content with doc-kit's own remark stringify (the MDX one for MDX pages), skipping synthetic pages.

This is part of a proof of concept of migrating rolldown.rs from VitePress to doc-kit. rolldown.rs serves both today, and this keeps parity without a post-build script.

Validation

• Tests for building the pages' Markdown (entries joined per page, in order; synthetic pages left out).
• Rolldown's build produces llms-full.txt and a .md file per page.

Related Issues

Part of the Rolldown docs migration PoC: rolldown/rolldown#11072. It's the top of a stack: #1125 (TypeDoc plugin) → #1126 (Graphviz diagrams) → #1127 (llms-full), each targeting the one below. The changes don't depend on each other, the stack just keeps them reviewable one at a time while the Rolldown PoC builds from the top branch.

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run node --run test and all tests passed.
• I have check code formatting with node --run format:check & node --run lint.
• I've covered new added functionality with unit tests if necessary.

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[codecov]

Codecov Report

❌ Patch coverage is 97.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.99%. Comparing base (4d01353) to head (d2523f5).

Files with missing lines	Patch %	Lines
packages/react/src/llms-txt-full/generate.mjs	90.32%	3 Missing ⚠️
...kages/react/src/llms-txt-full/utils/buildPages.mjs	96.66%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           feat/typedoc    #1127      +/-   ##
================================================
+ Coverage         92.96%   92.99%   +0.02%     
================================================
  Files               260      265       +5     
  Lines             25377    25527     +150     
  Branches           2585     2603      +18     
================================================
+ Hits              23592    23738     +146     
- Misses             1763     1767       +4     
  Partials             22       22              

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[github-actions]

api-links Generator

Performance estimate _{(single CI run)}

• Generation time: 4.2% faster (1.43 s → 1.37 s)
• Peak memory: 17.1% lower (423.48 MB → 351.26 MB)

json Generator

Performance estimate _{(single CI run)}

• Generation time: 1.2% slower (10.17 s → 10.29 s)
• Peak memory: 15.3% higher (1.45 GB → 1.67 GB)

legacy-html Generator

Performance estimate _{(single CI run)}

• Generation time: 53.0% slower (28.34 s → 43.37 s)
• Peak memory: 0.0% lower (2.45 GB → 2.45 GB)

legacy-json Generator

Performance estimate _{(single CI run)}

• Generation time: 28.5% slower (6.43 s → 8.26 s)
• Peak memory: 0.3% lower (1.58 GB → 1.58 GB)

llms-txt Generator

Performance estimate _{(single CI run)}

• Generation time: 14.3% slower (6.83 s → 7.81 s)
• Peak memory: 9.0% lower (1.56 GB → 1.42 GB)

orama-db Generator

Performance estimate _{(single CI run)}

• Generation time: 27.8% slower (6.41 s → 8.19 s)
• Peak memory: 4.2% higher (1.63 GB → 1.70 GB)

web Generator

Output size: 2 files changed · net +201.00 B

File size details

File	Main	PR	Change
assets/style-Dpi-h_PZ.css	—	137.38 KB	+137.38 KB
assets/style-CgRaeUUe.css	137.19 KB	—	-137.19 KB (-100.0%)

Performance estimate _{(single CI run)}

• Generation time: 12.8% faster (51.81 s → 45.16 s)
• Peak memory: 23.2% higher (3.25 GB → 4.00 GB)