docs: align package docs and keep one llms.txt index

[bntvllnt]

Summary

• Synchronize README, maintained llms.txt and related user documentation with current source and release availability.
• Keep a single LLM index; remove remaining repository full-text artifacts and relevant generation/package references.
• Improve external-facing preset documentation and remove full bundle from package surface assertions.

Verification

• Signed commits and clean isolated worktree; original checkout preserved.
• Independent review and verification passed on exact final commits.
• Relevant package tests, builds/typechecks, documentation checks, links and packaging checks passed; generator no-regeneration verified where applicable.
• No runtime API or AGENTS edits, no releases, archives, npm deprecations or merges.

[greptile-apps]

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