feat(output): add agent-readable query views

[forhappy]

Summary

• Add the strict, bounded compass.query.agent-view/1 projection with deterministic source and view digests.
• Make typed CLI and MCP query text answer-first while preserving raw JSON and discovery cursor v2 semantics.
• Document the contract, update assistant guidance, and add CLI, MCP, install, output, and query coverage.

Compatibility

• Raw query contracts remain authoritative and unchanged.
• Agent View is additive, versioned, deterministic, and bounded.
• Discovery pagination keeps its existing cursor semantics.

Verification

• cargo fmt --all -- --check
• cargo clippy --workspace --lib --bins --locked -- -D warnings
• cargo test --workspace --lib --bins --locked
• Focused CLI, MCP, output, query, install, relevance, and product-boundary checks.