docs: add repository context docs 🤖🤖🤖

[lirantal]

Adds standardized repository context for coding agents and maintainers:

• refreshes AGENTS.md with the shared routing template
• adds or links canonical docs for development, testing, architecture, and conventions
• adds RELEASE.md where missing for Changesets release guidance

No package behavior changes are included.

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Summary by cubic

Standardized repository docs for maintainers and coding agents, including a docs index and release guidance. No package behavior changes.

• New Features
  • Refreshed AGENTS.md with clear entry points and doc links.
  • Added docs/ with development.md, testing.md, architecture.md, and conventions.md, plus a docs index.
  • Linked the new docs from README.md.
  • Added RELEASE.md detailing the Changesets-based release flow and commands.

^{Written for commit 27ee551. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
aibom	Error		Jun 20, 2026 10:37am

[cubic-dev-ai]

No issues found across 8 files

_{Re-trigger cubic}