TINYDOC-3616: Remove the committed LLM attachments and the dead generator.

[kemister85]

Ticket: TINYDOC-3616

Site: Staging branch

Changes:

• Deleted modules/ROOT/attachments/llms.txt and llms-full.txt. The deploy on main now generates both files on every build (TINYDOC-3613), and the committed copies had already drifted from what the site serves.
• Deleted the unused -scripts/generate-llm-files.js, generate-llm-files.sh and README-llm-files.md, and the two generate-llm-files* entries in package.json that pointed at them. The generator and its documentation live on main.
• ai-coding-agents.adoc: llms-full.txt now contains the full content of every page, not an index of URLs, so its description in the table is updated to match.

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How to test locally:

Run these from your tinymce-docs checkout. They do not depend on folder names.

This branch alone (about a minute, plus the install):

git fetch origin && git switch hotfix/8/TINYDOC-3616
yarn install --frozen-lockfile
npx antora ./antora-playbook-local.yml
npx http-server build/site -p 4000

• The build prints no warnings.
• ls build/site/tinymce/latest/_attachments/ lists only tinymceai-mcp-demo and url-dialog-demo, with no llms*.txt.
• http://localhost:4000/tinymce/latest/ai-coding-agents/#llms-txt-files describes llms-full.txt as the full content of every page.
• git grep -nE "generate-llm-files|README-llm-files|attachments/llms" returns nothing.

The deploy steps with this branch's content (about 5 minutes; stop the server first). This shows the build no longer needs the committed files:

export DOCS=$(pwd)
git worktree add ../docs-main-3616 origin/main && cd ../docs-main-3616 && yarn install --frozen-lockfile
perl -pe 's#branches: \[ tinymce/5, tinymce/6, tinymce/7, tinymce/8 \]#branches: [ tinymce/5, tinymce/6, tinymce/7 ]\n  - url: $ENV{DOCS}\n    branches: hotfix/8/TINYDOC-3616#' antora-playbook.yml > playbook-test.yml
yarn antora ./playbook-test.yml && yarn build:markdown build/site && yarn generate-llm-files build/site
ls -l build/site/llms.txt build/site/llms-full.txt
cmp build/site/llms.txt build/site/tinymce/latest/_attachments/llms.txt && cmp build/site/llms-full.txt build/site/tinymce/latest/_attachments/llms-full.txt && echo identical

• llms-full.txt is about 3.9 MB.
• The last command prints identical.

The ERROR lines during the Antora step come from the archived tinymce/5 content and appear on main too. Clean up afterwards with cd "$DOCS" && git worktree remove --force ../docs-main-3616.

These steps were run as written on fresh clones on 2026-09-28, and every check passed.

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Pre-checks:

• Branch is correctly prefixed:
• Files removed have been deleted, not just excluded from the build (if applicable).
• Build passes without console errors, warnings, or issues.

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Review:

• Documentation Team Lead has reviewed.