v1.1.0 — Full ARCP v1.1 protocol conformance

What's new

Full ARCP v1.1 protocol surface

All normative v1.1 wire surfaces are now implemented:

• job.result_chunk — multi-kind streamed results (text, event, log, thought, metric, binary) with back-pressure and cooperative close
• Crash-and-resume — same IdempotencyKey → same job_id, buffered chunk replay via client.resultChunks(for:)
• lease_constraints.expires_at — submission validation + in-handler expiry checks via context.checkLeaseExpiration()
• cost.budget — per-invoke budget cap, context.charge() deductions, BUDGET_EXHAUSTED error, per-charge metrics
• model.use — payload parsing, requested-model matching, runtime policy enforcement
• provisioned_credentials — issue / rotate / revoke lifecycle with test provisioner

Documentation (docs/)

Complete docs/ tree added:

• Architecture overview and RFC mapping guide
• State diagrams for sessions, jobs, streams, subscriptions, and leases (SVG — light + dark)
• Troubleshooting guide covering common integration errors
• Extension authoring guide (§21 custom message types)

Recipes (Recipes/)

Four focused, self-contained runnable examples (each swift run from its directory):

Recipe	Demonstrates
email-vendor-leases	requestPermission + PermissionHandler veto (§15.4, §6.4)
mcp-skill	Bridging MCP call_tool as an ARCP ToolHandler (§20, §15.4, §10, §18.3)
multi-agent-budget	Cost-budget cap across serial worker steps (§17.3.1, §18.3)
stream-resume	Crash-and-resume for streamed ResultChunkStream (§10, §19, §7.2)

Transports

• StdioTransport — NDJSON framing over stdin/stdout (CLI arcp serve / arcp send / arcp tail / arcp replay)
• WebSocketTransport — client-side WebSocket transport (server-side deferred to v1.2)

No breaking changes

v1.1.0 is fully backward-compatible with v1.0.x client code. All new surfaces are additive.

Deferred to v1.2

mTLS / OAuth2 auth, sidecar binary stream frames, scheduled jobs, multi-agent delegation, trust elevation, checkpoint-based resume, full WebSocket server. See CONFORMANCE.md.