Implement KltRansacStrategy, the ADR-002 engine-rule mandatory
simple-baseline VioStrategy for E-C1. Pure-Python facade over
OpenCV's cv2.goodFeaturesToTrack / calcOpticalFlowPyrLK /
findEssentialMat / recoverPose pipeline — no C++/pybind11 binding
by design so a Tier-0 workstation runs the strategy with
`pip install opencv-python` and the BUILD_KLT_RANSAC=ON gate alone.
Constructor + state machine + FDR transition spine mirror
Okvis2Strategy + VinsMonoStrategy so the AZ-331 factory + IT-12
comparative harness treat all three as drop-in substitutable; the
duplication is the consolidation target now formally in scope for
the next cumulative review (batches 52-54).
AC coverage: AC-1..AC-11 + NFR-perf mapped to passing tests
(25 tests, 23 pass + 2 tier-2 skipped on dev/CI runners; all 25
pass under GPS_DENIED_TIER=2). Honest-covariance invariant (AC-9)
implemented as residual-scatter / (N_inliers - 5) with an inlier-
count penalty — no client-side floor or smoother; cov Frobenius
grows monotonically across DEGRADED. Camera-agnostic source
(AC-11) enforced by CI-grep gate that excludes docstring text.
Test-Run Cadence: focused suite tests/unit/c1_vio/ green (95 passed,
6 skipped); config-loader + compose-root suites green; full-suite
gate deferred to Step 16 per implement skill.
Co-authored-by: Cursor <cursoragent@cursor.com>
VinsMonoStrategy: Python facade conforming to AZ-331 Protocol; mirrors
the AZ-332 OKVIS2 facade so the AZ-331 factory + IT-12 comparative
harness can treat both as drop-in substitutable. Native binding is a
pybind11 skeleton compiled behind BUILD_VINS_MONO=ON (default OFF for
airborne / operator-tooling / replay-cli per module-layout.md
Build-Time Exclusion Map). Real vins_estimator wiring is the Tier-2
follow-up.
VinsMonoConfig added to c1_vio/config.py with sliding-window /
feature-tracker / marginalisation / opt-iteration knobs plus
__post_init__ validation; exported through the package __init__.
cpp/vins_mono/CMakeLists.txt replaces the AZ-263 placeholder with full
pybind11 wiring: Risk-1 mitigation forces VINS_MONO_USE_ROS=OFF;
Risk-2 mitigation links Eigen from the same cpp/_third_party/eigen pin
as OKVIS2; Risk-3 mitigation enforces BUILD_VINS_MONO=OFF in
deployment binaries via the gate at the top of the file.
Tests: 17 new in test_vins_mono_strategy.py (15 pass + 2 tier2 skip);
fake_vins_mono_binding fixture added to conftest.py mirroring the
fake_okvis2_binding pattern; test_protocol_conformance updated to drop
vins_mono from _STRATEGIES_WITHOUT_PY_MODULE so the existing
parametrised factory tests route through the new strategy.
Focused c1_vio suite: 72 passed, 4 skipped. Full suite: 1788 passed,
1 unrelated pre-existing flake (c12 cold-start perf, env-bound).
Co-authored-by: Cursor <cursoragent@cursor.com>
Python facade (`Okvis2Strategy`) is production-quality and satisfies
AZ-331's `VioStrategy` protocol; full AC-1..10 coverage with
AC-9 + NFR-perf marked `tier2`. The C++ pybind11 binding compiles
and loads but throws `OkvisFatalException("estimator not yet wired")`
on first `add_frame` — the `okvis::ThreadedKFVio` wiring is a tier2
follow-up the Step-15 Product Completeness Gate is expected to track
as a remediation task.
Resolved contradictions:
* Constructor signature aligned with the AZ-331 factory: `(config, *,
fdr_client, clock=None)`. Calibration / preintegrator / logger
built internally from config. No churn on AZ-331.
* IMU substrate: OKVIS2 owns its internal estimator IMU integration;
the AZ-276 `ImuPreintegrator` is a separate substrate consumed by
E-C5's fusion graph. Single source of truth lives at the sample
stream, not the integrator instance.
* FDR API: `FdrClient.enqueue(record)` with new `vio.health` kind
added to AZ-272 `KNOWN_PAYLOAD_KEYS`.
CI matrix forces `-DBUILD_OKVIS2=OFF` until the tier2 wiring task
brings Ceres / SuiteSparse / OKVIS2 vendored submodules into the
Linux build.
Files: 17 added/modified across `c1_vio/`, `fdr_client/records.py`,
`cpp/okvis2/CMakeLists.txt`, CI workflow, AZ-332 task spec
(implementation-notes section), batch 23 report.
Tests: 17 new (15 tier1 + 2 tier2). Full Tier-1 suite: 1109 pass,
2 skipped (env), 2 deselected (tier2). No regressions.
Co-authored-by: Cursor <cursoragent@cursor.com>
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>
Oleksandr Bezdieniezhnykh