WCP v0 + Agent Hooks Core v0.1 (first spec release)

First tagged specification release.

• Agent Hooks Core v0.1 (draft): docs/protocol/hooks-core-v0.md, with the conformance runner (packages/conformance) and reports for five adapters (docs/standardization/reports).
• Weft Coordination Protocol v0: docs/protocol/wcp-v0.md, with the reference implementation in this repo.

Proposed to the Agentic AI Foundation: aaif/project-proposals#53