v5.7.0 — V5-6 routing-plane de-vaulting

MINOR. The kernel's routing layer is now backend-agnostic. Three mechanisms that previously built vault_path() / … filesystem paths — resolve_project / _vault_projects_dir, repo_registry, and the state_mode resolver — now speak Locators to the V5-1 storage seam. On the obsidian-vault backend behavior is byte-identical (LC-1). A fresh install with only device-local can now host a project, its harness state, and the repo registry without a vault. state_mode: vault in device config and .project-mode markers is aliased to state_mode: backend at read time — no operator migration required (LC-5). Gate extensions enforce the no-Path-leak and one-way-import-direction invariants on the routing layer. AGENTM_DEVICE_LOCAL_ROOT env-var override added for test isolation in CI environments without the obsidian-vault plugin. This is the third and final leg of the V5 de-vaulting arc. Gates: 20/20, CI green across Linux/Mac/Windows.

Added

• V5-6 — resolve_project / _vault_projects_dir via seam (b762987). harness_memory._vault_projects_dir signature changed from (vault: Path) -> Path to (backend: StorageBackend) -> Locator; resolve_project returns {slug, project_locator, backend, project_root, layout} instead of {slug, vault_path, project_root, layout}. Callers in process_seam.py and memory_mcp_tools.py updated to use project_locator.key. 10 new tests. LC-7 parallel-run: VaultBackend Locator resolves to same on-disk path.

• V5-6 — repo_registry onto the seam (3af7fa6). registry_path(vault) -> Path replaced by registry_locator(backend) -> Locator; _vault_or_none() replaced by _backend_or_none() (lazy-imports select_backend()); all five public functions (read_registry, write_registry, register_repo, unregister_repo, list_repos) now take StorageBackend. _mutate_registry drops vault_mutex (held internally by VaultBackend.write()); write_registry adds an explicit content-hash CAS. CLI graceful-skip fires when select_backend() raises, not merely when MEMORY_VAULT_PATH is unset. 10 new/rewritten tests.

• V5-6 — state_mode: vault → backend alias (b62e378). _read_config_state_mode and _read_project_mode alias "vault" → "backend" at read time — one-line guard, no rewrite, no operator migration (LC-5). agentm_config._STATE_MODES adds "backend" as the canonical value; cmd_set_state_mode normalizes "vault" → "backend" at write time. 5 new/updated tests.

• V5-6 — gate extensions + conformance suite for routing layer (51b1a32). check-storage-seam-no-path-leak.py Pass 2 checks 8 named routing functions in harness_memory.py and repo_registry.py for pathlib.Path return annotations. check-process-seam-import-direction.sh LC-8 block scans routing files for storage_vault imports. storage_conformance.py gains check_routing_repo_registry() and ROUTING_CHECKS; ConformanceSuite.test_routing_repo_registry() is now inherited by all conformance subclasses. 8 new tests across three gate test files.

• V5-6 — ADR 0019 + wiki sweep (e185946). ADR 0019 records the three-leg de-vaulting arc completion, all locked design calls (LC-1/4/5/6/7/8), and load-bearing assumptions with re-audit triggers. Decisions.md + decisions/_Sidebar.md updated. device-wide-architecture.md v1.0 entry finalized. Storage-Seam.md routing layer NOTE updated to complete. Single-Repo-State-Mode.md updated: state_mode value "vault" → "backend" with backward-compat note.

Internal

• CI test isolation — AGENTM_DEVICE_LOCAL_ROOT + backend mocks (4a28b1c). storage_device_local._default_root() reads $AGENTM_DEVICE_LOCAL_ROOT to redirect the device-local root in CI without the vault plugin. 2 subprocess CLI tests updated to use this env var; 2 in-process tests updated to patch backend_selection.select_backend directly.

• CI verify-phases.sh vault pass fix (d055423). Set OBSIDIAN_VAULT_SCRIPTS=$REPO/scripts so the vault pass can load the kernel VaultBackend as a stand-in when the crickets obsidian-vault plugin is absent in CI. verify-phases: 32/32 (was 31/32).

Full changelog: See CHANGELOG.md.