docs: add llms.txt for AI-agent discoverability

[vaaraio]

Summary

Adds an llms.txt at repo root following the llmstxt.org format. Points AI agents and crawlers at the repo, packages, docs, integrations, and key external references in a single deterministic file. Same content served at https://vaara.io/llms.txt.

Test plan

• Verify file renders as plain text at https://github.com/vaaraio/vaara/blob/main/llms.txt
• Verify all linked paths resolve (README, COMPLIANCE.md, docs/formal_specification.md, bench/vaara-bench-v1.md, CHANGELOG.md, docs/openapi.yaml, docs/signing-keys.md)

Summary by CodeRabbit

• Documentation
  • Added comprehensive compliance documentation with structured links to specifications, integration tools, cloud adapters, and governance resources.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ea034193-a449-4a2a-8840-616485d4b564

📥 Commits

Reviewing files that changed from the base of the PR and between 0ee1ea6 and d2ecdd4.

📒 Files selected for processing (1)

• llms.txt

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📝 Walkthrough

Walkthrough

This PR adds content to llms.txt, a metadata file that documents the Vaara runtime evidence layer with structured information including repository links, package references, documentation resources, integration points, and quantitative metrics for EU AI Act compliance.

Changes

Vaara Project Metadata

Layer / File(s)	Summary
Vaara project metadata in llms.txt llms.txt	llms.txt is populated with project overview, repository and package links (PyPI, npm), documentation references (README, COMPLIANCE mapping, formal specification, benchmark, changelog, HTTP API contract, signing keys), integration points (framework adapters, cloud guardrail adapters, OVERT tooling), quantitative metrics, and optional governance resources.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A metadata file so neat,
Llms.txt makes docs complete,
Vaara's compliance story told,
Links and specs in structured gold,
Evidence layer, now unfold! 🌟

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: add llms.txt for AI-agent discoverability' directly and accurately summarizes the main change: adding an llms.txt file for AI-agent discovery purposes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-llms-txt

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