feat(llms): drop cookbook author pages and advertise .md URLs

[nibzard]

Summary

Two index-hygiene changes for the agent-facing surfaces:

• Drop cookbook author pages from the LLM index. Author pages are ego listings ("N recipes contributed by X") with little value for coding agents. They now carry `llm: false`, removing ~7 noise links from `llms.txt` and excluding them from `llms-full.txt`. `scripts/sync-cookbook.ts` emits the flag on author pages so the exclusion survives a re-sync. Topic hubs are kept: after the markdown-cleanup work (feat(llms): strip MDX noise from LLM-served markdown #83) they render as curated recipe link lists, which are useful agent navigation, so they stay in the index.
• Update agent instructions to point agents at the `.md`-suffix convention (append `.md` to any docs URL) instead of the internal `/llms.mdx/` path, and to position `/llms-full.txt` as a large (~230k-token) corpus to fetch per-page from rather than read whole.

Notes

• `sync-cookbook` regenerates all cookbook files and pulled in unrelated upstream recipe drift; I reverted that and re-applied only the author `llm: false` field, so this PR contains no unrelated content changes (and `cookbook.lock.json` is left untouched to stay consistent with the reverted content).
• Dropped the planned "Overview Getting Started" title fix: only one page triggers the disambiguation and there's no safe one-line rule (using the page slug would turn "Sessions Api Quickstart" into "Quickstart Quickstart"). The entry has a clear description, so not worth the added generator complexity.

Testing

• New `tests/cookbook-llm-flags.test.ts` guards the contract: every author page has `llm: false`, every topic page does not.
• Regenerated `llms.txt`: 0 author entries, 18 topic entries retained; new agent-instruction lines present.
• `bun test tests/` (201 pass), Biome (`--error-on-warnings`), `tsc --noEmit`, `bun run build` all clean.

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Jul 29, 2026 6:39pm