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Oleksandr Bezdieniezhnykh
ab92946833
Batch 5b completes the helpers sweep for cycle-1 Step 13. For each of the four remaining helpers (sha256_sidecar, engine_filename_schema, ransac_filter, descriptor_normaliser): - Append "Cycle-1 operational reality" section to the existing common-helpers/<NN>_*.md, documenting the shipped interface, exception types, public constants, determinism / validation invariants, and AZ-task lineage. Specific cycle-1 facts captured per helper: - sha256_sidecar (AZ-280): single Sha256SidecarError hierarchy, SIDECAR_SUFFIX public constant, sidecar format is pure lowercase 64-char hex (no JSON), verbatim ".sha256" suffix append, streaming digests in 1 MiB chunks, verify-returns-False semantics for missing payload vs. raise for missing sidecar, byte-deterministic aggregate_hash with sorted-by-str basenames. - engine_filename_schema (AZ-281): EngineFilenameSchemaError, ENGINE_SUFFIX and ALLOWED_PRECISIONS public constants, strict model validation ([a-z0-9_]+ ≤64 chars no __), dotted version regex, non-bool sm validation, matches_host ignores precision by design. - ransac_filter (AZ-282 / AZ-623): RansacFilterError, frozen RansacResult dataclass, cv2.setRNGSeed(0) determinism, median-not-mean residual, NaN for empty inliers, min_inliers is informational only, filter_correspondences uses perspectiveTransform vs. compute_reprojection_residual uses projectPoints, OK to import se3_utils (both Layer 1). - descriptor_normaliser (AZ-283 / AZ-338): DescriptorNormaliserError, ALLOWED_DTYPES = (float16, float32), float32 norm computation with dtype-preserving cast-back, new intra_cluster_normalise method for NetVLAD per-cluster L2 (AZ-338), descriptor_metric returns "inner_product" string. Two contract files (descriptor_normaliser.md and ransac_filter.md mention follow-up) need follow-up minor revisions to match shipped surface; queued for the contracts-folder sweep. Bumps _docs/_autodev_state.md sub_step to tests-doc-updates phase 9. Co-authored-by: Cursor <cursoragent@cursor.com>