Release v1.6.2

What changed

• Removed the unused tools field from the provider capability matrix.
• Cleaned capability definitions in the provider registry to keep the contract minimal and aligned
  with actual runtime behavior.
• Updated related capability assertions in tests.
• Updated architecture and README capability listings to reflect the simplified matrix.

Why it matters

• Reduces noise in the capability contract.
• Keeps strict/permissive capability checks focused on features that are actually implemented and
  enforced.
• Improves long-term maintainability by avoiding speculative contract fields.

Stability Statement

• v1.6.2 is a patch cleanup release.
• No CLI behavior changes.
• No provider execution behavior changes.
• No output schema/contract changes.

Scope Clarification

• Stateless execution model remains unchanged.
• No orchestration, memory, agent behavior, or tool-calling features were introduced.

Scope Clarification

• chore(v1.6.2): remove unused tools capability from provider matrix by @damienSavoldelli in #29
• release(v1.6.2): prepare patch cleanup release by @damienSavoldelli in #30

Full Changelog: v1.6.1...v1.6.2