Summary of Changes

[ajit-zer07]

Phase 1: Proto Sync + Discovery Surface Fixes

• proto/macp/v1/core.proto: Added TransportEndpoint message and transport_endpoints field (8) on AgentManifest
• src/server.rs: stream: false on capabilities; GetManifest handles agent_id (empty/"macp-runtime" → self, else → not_found), content types → application/macp-envelope+proto, added transport_endpoints; ListModes returns only Decision Mode with semver 1.0.0 and schema_uris
• src/runtime.rs: registered_mode_names() filters out multi_round (experimental)
• 9 new tests for discovery surface

Phase 2: Session Data Model + Envelope Validation

• src/session.rs: Added context, roots, initiator_sender fields to Session
• src/runtime.rs: Populates new fields from SessionStartPayload and env.sender
• src/server.rs: Validates sender and message_type are non-empty
• All test Session constructors updated across 4 files
• 4 new tests for context/roots/initiator_sender and validation

Phase 3: Mode-Aware Authorization

• src/mode/mod.rs: Added authorize_sender() default method on Mode trait
• src/mode/decision.rs: Overrides authorize_sender — orchestrator (session initiator) can send Commitment even if not in participants
• src/runtime.rs: Replaced hardcoded participant check with mode.authorize_sender() delegation
• 3 new tests for orchestrator bypass and unchanged multi_round behavior

Phase 4: Decision Mode Correctness

• src/mode/decision.rs: Legacy Message/resolve scoped to "decision" alias only; canonical mode rejects unknown message types; Commitment requires proposals (not votes)
• 6 new/updated tests for legacy scoping and commitment rules

Phase 5: Version Alignment + Docs + Clients

• Cargo.toml: 0.1.0 → 0.3.0
• src/main.rs: v0.3 → v0.3.0
• src/server.rs: version "0.3" → "0.3.0"
• README.md: v0.2 → v0.3, updated feature list, noted streaming not fully implemented
• docs/*: Updated all version references
• src/bin/client.rs: Rewritten to demonstrate canonical Proposal → Evaluation → Commitment lifecycle
• CLAUDE.md: Updated to reflect all changes

Summary

Describe the changes introduced by this pull request.

Type of Change

• New feature
• Bug fix
• Refactoring
• New mode implementation
• Proto schema change
• Documentation improvement
• CI / tooling change

Checklist

• cargo test passes
• cargo clippy has no warnings
• cargo fmt has been run
• Protobuf definitions compile successfully
• New modes implement the Mode trait correctly (if applicable)
• Error variants added to MacpError (if applicable)
• This change preserves MACP Core invariants