docs: publish split HTML manual with GitHub Pages - #10

Reviewed by building the workflow end-to-end in an isolated checkout of this branch (68c43db). Thanks — the approach is sound and the security scoping is correct, but there's one blocking defect that stops it from ever publishing.

Blocker — output directory name mismatch (Prepare site step fails).
make html with --split=node produces docs/codebud.html/ (dot). The build step correctly asserts test -f docs/codebud.html/index.html, but the next step copies from docs/codebud_html/ (underscore):

cp -a docs/codebud_html/. site/

Run verbatim, this fails with cp: cannot stat 'docs/codebud_html/.': No such file or directory, the step aborts (run: uses bash -e), and site/index.html is never created — so on main the artifact upload and Pages deploy never happen. The repo's own .gitignore (line 34) tracks docs/codebud.html, confirming the dot form is correct; this PR's own Testing notes also cite docs/codebud.html/index.html.

Fix: change the copy source to docs/codebud.html/.. With that one change I verified site/ is populated correctly and site/index.html + site/llms.txt are present.

Verified and correct (no change needed):

• --no-split → --split=node in docs/Makefile.am: builds cleanly, produces the split manual.
• make html is a valid top-level target; configure deps (requests prompt_toolkit) are sufficient.
• Trigger model: push/pull_request on main (path-filtered) + workflow_dispatch.
• Security scoping is right: top-level permissions: contents: read; pages: write/id-token: write are confined to the deploy job, which — together with the artifact upload — is gated if: github.event_name != 'pull_request', so a PR only builds (no deploy, no privileged token, no secrets). Uses pull_request, not pull_request_target.

Before merge (maintainer action, not a code change): GitHub Pages must be set to "GitHub Actions" as source, or the deploy job fails on main.

Requesting changes for the one-line path fix; everything else looks good.

Thank you for addressing the path mismatch (docs/codebud.html/ vs docs/codebud_html/). I have verified the fix and rebased this branch onto current main so it is merge-ready (2 commits ahead, no conflicts).

Please note for future contributions: when a review requests a blocking change, it helps to follow up promptly so the PR does not sit idle for an extended period. Aside from that delay, the change itself looks good.

Approving.