feat: implement daemon model with registry and single-asset assignment (BAT-010, REQ-023/028)

Core Implementation (BAT-010):
- Add daemon registry schema and CRUD operations (req-023)
- Implement single-daemon asset assignment constraint (one asset per daemon)
- Add daemon_id field to service_token for daemon identification
- Add daemon.py CLI module for daemon management commands
- Add 20260513_0016_daemon_model.py migration for daemon tables

API Changes:
- GET /v1/assets: include daemon_id in AssetResponse
- POST /v1/assets/{asset_id}/ledger/trades: require daemon token binding
- GET /v1/user_info: include daemon metadata
- Enhanced service-token rotate to preserve daemon bindings

CLI Commands:
- pfhub daemon register --name <name> --runtime-id <runtime-id>
- pfhub daemon list
- pfhub daemon get <daemon-id>
- pfhub daemon revoke <daemon-id>

Requirements (REQ-023, REQ-028):
- REQ-023: Daemon Registry and Service Token Daemon Binding (Interface, Approved)
  * AC-1: daemon CRUD operations
  * AC-2: service token daemon binding for POST /v1/assets/{asset_id}/ledger/trades
  * AC-3: single daemon per asset (exact-one assignment model)
- REQ-028: README.md Daemon Provisioning Runbook update (Documentation, Approved)

Documentation:
- Add dcy-006 Discovery for daemon-id and single-daemon asset assignment
- Update README.md with Daemon Provisioning Runbook section
- Add BAT-010 batch documentation with planning, implementation, verification
- Update rel-006 release document (daemon model implementation)
- Update data-model.md with daemon and daemon_asset_assignment tables
- Update interface-contract.md with daemon registry APIs
- Update runtime-flows.md with daemon lifecycle flows

Breaking Changes:
- REQ-005~009, REQ-011~012 status reverted to Approved due to revised contract
  * daemon_id field addition and exact-one asset assignment requirement
  * Existing Implemented evidence invalidated by contract revision
  * BAT-001/002/008 re-verification required

Testing:
- Add test_daemon_registry.py for daemon CRUD operations
- Add test_daemon_assignment.py for single-asset assignment constraints
- Update test_auth.py, test_cli.py, test_v1.py for daemon support
- Verify daemon token binding in trade endpoint authorization

Impact:
- Database: 2 new tables (daemons, daemon_asset_assignments)
- Migration: 20260513_0016 creates daemon model schema
- CLI: 4 new daemon subcommands
- API: daemon_id propagation through v1 endpoints
- Verification: BAT-001/002/008 re-verification gates next release

docs/releases/index.md

@@ -12,4 +12,5 @@
 | REL-002 | tooling | released | BAT-002, BAT-005, BAT-008 | minor-change + dcy-002 / REQ-011, REQ-012, REQ-015 | [rel-002_20260511_operator-cli-tooling-and-baseline-docs-sync](./rel-002_20260511_operator-cli-tooling-and-baseline-docs-sync.md) |
 | REL-003 | tooling | released | BAT-003, BAT-004, BAT-007 | dcy-003 + dcy-001 / REQ-013, REQ-014, REQ-001~003 | [rel-003_20260512_cli-user-scoping-and-db-ops-runbook](./rel-003_20260512_cli-user-scoping-and-db-ops-runbook.md) |
 | REL-004 | app-service | released | BAT-006 | dcy-004 / REQ-016~019 | [rel-004_20260512_portfolio-uuid-migration-and-api-uuid-switch](./rel-004_20260512_portfolio-uuid-migration-and-api-uuid-switch.md) |
-| REL-005 | docs-only | confirmed | BAT-009 | dcy-005 / REQ-020~022 | [rel-005_20260512_production-operator-runbook-and-credential-matrix](./rel-005_20260512_production-operator-runbook-and-credential-matrix.md) |
+| REL-005 | docs-only | confirmed | BAT-009 | dcy-005 / REQ-020~022 | [rel-005_20260512_production-operator-runbook-and-credential-matrix](./rel-005_20260512_production-operator-runbook-and-credential-matrix.md) |
+| REL-006 | app-service | draft | BAT-010 | dcy-006 / REQ-005~009, REQ-011~012, REQ-023, REQ-028 | [rel-006_20260513_daemon-model-implementation](./rel-006_20260513_daemon-model-implementation.md) |