[AZ-348] C3.5 ConditionalRefiner Protocol + factory + PassthroughRefiner

Defines the public `ConditionalRefiner` Protocol (PEP 544
@runtime_checkable, two methods: `refine_if_needed` +
`was_invoked`), extends `MatchResult` in-place with two
default-valued refinement fields (`refinement_label`,
`refinement_added_latency_ms`), defines the `RefinerError` family
(`RefinerBackboneError`, `RefinerConfigError`), and ships the
trivial `PassthroughRefiner` reference impl.

Both refiner strategies are linked unconditionally — no
`BUILD_REFINER_*` flag (NOT ADR-002 territory). Runtime selection
only per ADR-001. `PassthroughRefiner` returns the input
`MatchResult` by reference (bit-identical correspondences per
contract INV-5) and always reports `was_invoked() is False`.

Documentation: renames `module-layout.md` `c3_5_adhop` Public API
symbol from `AdHoPRefinementStrategy` to `ConditionalRefiner`
(AC-14) so the doc agrees with `description.md` and the contract.

AC-9 (single-thread binding) deferred to AZ-270 runtime-root
composition, mirroring AZ-336 / AZ-342 / AZ-344 Risk-4 precedent.
AC-7 for the `"adhop"` strategy stops at `ModuleNotFoundError`
because the AdHoP backbone is owned by AZ-349. All other ACs +
NFRs covered by 36 new conformance tests.

Architectural note: `PassthroughRefiner.inference_runtime` is
typed as `object` because the L3→L3 import ban
(`test_az270_compose_root`) forbids c3_5_adhop from importing
c7_inference; the runtime-root factory narrows the type at
construction time.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/02_document/contracts/c3_5_adhop/conditional_refiner_protocol.md

@@ -4,8 +4,8 @@
 **Producer task**: AZ-348 (Protocol + factory + DTOs + composition + `PassthroughRefiner`)
 **Consumer tasks**: AZ-349 (`AdHoPRefiner` real refinement); downstream c4_pose (epic AZ-259) which consumes the (possibly refined) `MatchResult`
 **Version**: 1.0.0
-**Status**: draft, awaiting Producer task implementation
-**Last Updated**: 2026-05-10
+**Status**: v1.0.0 (AZ-348 implemented 2026-05-12; PassthroughRefiner shipped — AdHoPRefiner pending AZ-349)
+**Last Updated**: 2026-05-12
 **Module-layout home**: `src/gps_denied_onboard/components/c3_5_adhop/interface.py` (Protocol), `src/gps_denied_onboard/components/c3_5_adhop/__init__.py` (re-exports), `src/gps_denied_onboard/runtime_root/refiner_factory.py` (factory)
 
 > **Public API symbol naming.** The component's public interface symbol is named `ConditionalRefiner` in `description.md` § 2 and `AdHoPRefinementStrategy` in `module-layout.md` § c3_5_adhop. Both refer to the SAME Protocol; the canonical class name in code is `ConditionalRefiner` — it is the role description-first name and matches the method `refine_if_needed`. The producer task ALSO updates `module-layout.md` to align (`AdHoPRefinementStrategy` → `ConditionalRefiner`) so the two documents agree.

_docs/02_document/module-layout.md

@@ -89,11 +89,15 @@ Bootstrap reference: `_docs/02_tasks/todo/AZ-263_initial_structure.md`. Architec
 - **Epic**: AZ-258 (E-C3.5 AdHoP Refinement)
 - **Directory**: `src/gps_denied_onboard/components/c3_5_adhop/`
 - **Public API**:
-  - `__init__.py` (re-exports `AdHoPRefinementStrategy`)
-  - `interface.py` (`AdHoPRefinementStrategy` Protocol)
-- **Internal**: `default_refiner.py`
-- **Owns**: `src/gps_denied_onboard/components/c3_5_adhop/**`, `tests/unit/c3_5_adhop/**`
-- **Imports from**: `_types`, `helpers.ransac_filter`, `helpers.se3_utils`, `config`, `logging`, `fdr_client`
+  - `__init__.py` (re-exports `ConditionalRefiner`, `C3_5RefinerConfig`)
+  - `interface.py` (`ConditionalRefiner` Protocol)
+  - `config.py` (`C3_5RefinerConfig`)
+  - `errors.py` (`RefinerError`, `RefinerBackboneError`, `RefinerConfigError` — held internal to the component; consumers reach them only via tests)
+- **Internal**:
+  - `passthrough_refiner.py` (reference baseline; AZ-348)
+  - `adhop_refiner.py` (production-default; AZ-349 pending)
+- **Owns**: `src/gps_denied_onboard/components/c3_5_adhop/**`, `tests/unit/c3_5_adhop/**`, `src/gps_denied_onboard/runtime_root/refiner_factory.py`
+- **Imports from**: `_types`, `helpers.ransac_filter` (R14: SHARED with C3 and C4 — owned by helper, NOT by C3.5), `helpers.se3_utils`, `components.c7_inference`, `config`, `logging`, `fdr_client`
 - **Consumed by**: `c4_pose`, `runtime_root`
 
 ### Component: c4_pose

_docs/_autodev_state.md

@@ -8,7 +8,7 @@ status: in_progress
 sub_step:
   phase: 2
   name: detect-progress
-  detail: "batch 24 in flight (per-task commits): AZ-336 done, AZ-342 done, AZ-344 done; next AZ-348"
+  detail: "batch 24 complete (AZ-336, AZ-342, AZ-344, AZ-348 per-task commits); ready to plan batch 25"
 retry_count: 0
 cycle: 1
 tracker: jira