Freezes the c1_vio Public API per
_docs/02_document/contracts/c1_vio/vio_strategy_protocol.md v1.0.0:
- VioStrategy Protocol (4 methods: process_frame, reset_to_warm_start,
health_snapshot, current_strategy_label) in
components/c1_vio/interface.py.
- DTOs (VioOutput, VioHealth, FeatureQuality, WarmStartPose) + VioState
enum in _types/nav.py — L1 placement so C5 + C13 consume them without
crossing the components.* boundary (AZ-270 AC-6). The new VioOutput
shape (frame_id: str, relative_pose_T: gtsam.Pose3,
pose_covariance_6x6, imu_bias, feature_quality, emitted_at_ns)
replaces the AZ-263 scaffolding in _types/vio.py, which is now
deleted.
- VioError family (VioInitializingError / VioDegradedError /
VioFatalError) in components/c1_vio/errors.py. Documented
rationale: the degraded-operation path returns a VioOutput with
inflated covariance + VioHealth.state=DEGRADED rather than raising
VioDegradedError — the error type exists only for the rare
degraded->fatal transition.
- C1VioConfig per-component config block (strategy enum,
lost_frame_threshold default 9, warm_start_max_frames default 5)
with constructor-time validation rejecting unknown strategy labels.
- StrategyNotAvailableError added to runtime_root/errors.py;
composition-time error distinct from the VioError family.
- Composition-root factory build_vio_strategy in
runtime_root/vio_factory.py with three BUILD_* gates (BUILD_OKVIS2,
BUILD_VINS_MONO, BUILD_KLT_RANSAC). Concrete strategy modules are
imported lazily via __import__ AFTER the flag check — Tier-0
workstation builds with the flag OFF MUST NOT load the strategy
module (Risk-2 / I-5; verifiable via sys.modules).
- 36 conformance tests cover all 9 ACs + NFR-perf-factory
(p99 build under 200 ms x 1000 calls) + NFR-reliability-error-family.
AC-8 introspects the contract file's Shape table and asserts method
parity against the runtime Protocol; AC-9 asserts the frame_id
annotation is 'str' (PEP-563 stringified).
C5 migration (consumers of the new VioOutput shape):
- gtsam_isam2_estimator.py + eskf_baseline.py: replaced
vio.timestamp -> vio.emitted_at_ns (drops _datetime_to_ns on the
VIO path), vio.pose_se3 -> vio.relative_pose_T (gtsam.Pose3 direct;
drops _pose_se3_to_gtsam / _pose_se3_to_array), vio.covariance_6x6
-> vio.pose_covariance_6x6 (rename).
- key_for_frame signature widened to UUID | int | str to accept the
new str frame_id.
- 4 C5 test files migrated to the new VioOutput shape with helper
fixtures producing ImuBias + FeatureQuality + str frame_id.
- c5_state/interface.py TYPE_CHECKING import path updated.
Bootstrap healthcheck + test_types_importable updated to drop the
deleted _types/vio module and pick up _types/inference (AZ-297) in
the same sweep.
Full unit-test sweep: 884 passed, 2 pre-existing environment skips
(cmake, actionlint).
Co-authored-by: Cursor <cursoragent@cursor.com>
Replaces AZ-382 NotImplementedError placeholders with real GTSAM factor
adds wired against the iSAM2 graph handle:
- add_vio -> BetweenFactorPose3 between consecutive VIO pose keys
(first call primes the chain; AZ-388 owns first-keyframe seeding).
- add_pose_anchor -> mode-dispatch per pose.covariance_mode:
"marginals" -> PriorFactorPose3 + handle.update();
"jacobian" -> skip iSAM2 add per AZ-361 contract.
Both paths bump _last_anchor_ns via time.monotonic_ns().
- add_fc_imu -> shared ImuPreintegrator.integrate_window +
reset_for_new_keyframe; builds a CombinedImuFactor between the
prev/curr (X, V, B) keyframe triple. Introduces new 'v' (velocity)
and 'b' (bias) GTSAM key namespaces decoupled from the VIO/pose
frame_id mapping.
Invariant 2 - non-decreasing timestamps - enforced per call with
EstimatorDegradedError + c5.state.out_of_order log. Every successful
add emits a structured DEBUG *_ok log; every failure emits a
structured ERROR *_failed log and raises through the C5 error
hierarchy (R05).
Contract-vs-reality fix-ups also landed:
- StateEstimator Protocol: add_fc_imu(ImuWindow) - was incorrectly
annotated as ImuTelemetrySample by AZ-381.
- _last_anchor_ns semantics switched to monotonic_ns() to match
last_anchor_age_ms.
- create() factory back-wires the ISam2GraphHandle to the estimator
via the new attach_handle() method.
Tests: +21 in tests/unit/c5_state/test_az383_factor_adds.py covering
all 8 ACs with mock ISam2GraphHandle instances. Three obsolete
AZ-382 tests (test_ac10_add_*_raises_named_az383) removed. Full
suite: 565 passed, 2 skipped.
Co-authored-by: Cursor <cursoragent@cursor.com>
Oleksandr Bezdieniezhnykh