v2.1.0

What's Changed

• feat: establish v2.1 canonical multi-agent contracts by @eaglesjo in #7
• feat: add v2.1 reference multi-agent runtime by @eaglesjo in #8
• test: add v2.1 multi-agent e2e conformance fixture by @eaglesjo in #9
• feat: enforce v2.1 retry lineage and failure evidence by @eaglesjo in #10
• test: add v2.1 parallel work conformance fixture by @eaglesjo in #11
• feat: add v2.1 human approval conformance by @eaglesjo in #12
• feat: enforce v2.1 handoff provenance and ownership by @eaglesjo in #13
• feat: enforce v2.1 work unit lifecycle transitions by @eaglesjo in #14
• feat: enforce v2.1 evidence identity by @eaglesjo in #15
• feat: enforce v2.1 canonical identity immutability by @eaglesjo in #16
• feat: enforce v2.1 work unit lineage integrity by @eaglesjo in #17
• feat: enforce v2.1 agent contract binding integrity by @eaglesjo in #18
• feat: enforce v2.1 evaluation actor authorization by @eaglesjo in #20
• feat: make v2.1 work unit lineage immutable by @eaglesjo in #21
• fix: align v2.1 evaluation acceptance runtime with schema by @eaglesjo in #22
• fix: harden v2.1 reference runtime contracts by @eaglesjo in #23
• release: 2.1.0 contract-first multi-agent engineering by @eaglesjo in #24

Full Changelog: v2.0.2...v2.1.0