fix: align log cli API surface

[creatornader]

Summary

• update spec.yaml to match the current atrib log API surface
• add promoted CLI commands for proof, feed-json, log-pubkey, and stream
• expose the finite new endpoints through MCP and keep SSE streaming CLI-only
• document generator patches that preserve the hand-maintained parity fixes

Validation

• go test ./...
• go build ./...
• git diff --check
• go run ./cmd/atrib-log-pp-cli api --agent
• go run ./cmd/atrib-log-pp-cli api proof --agent
• go run ./cmd/atrib-log-pp-cli api stream --agent
• go run ./cmd/atrib-log-pp-cli which proof --agent
• go run ./cmd/atrib-log-pp-cli log-pubkey --agent --timeout 10s
• go run ./cmd/atrib-log-pp-cli feed-json --agent --limit 1 --timeout 10s
• live proof lookup from a recent feed item
• explicit short-timeout stream smoke