Replace the manual Canon AFInfo2 reader with generated tables

[swackhamer]

Canon AFInfo2/AFInfo3 metadata was decoded through a separate manual field sequence and mode map. This replaces that reader with the generated Canon::AFInfo2 table through the shared IFD/serial path, deleting the duplicate arm, eight private offsets, two parent IDs and the 20-value mode enum.

Effective processors and validation operands come from authenticated pinned ExifTool source. Generated ownership does not revive the retired manual decoder on refusal; the reader discards speculative child values/state while preserving earlier parent effects. Old AFInfo geometry and four CanonRaw parent omissions remain explicit separate work. The plan now records shared read/write definitions, separate writer acceptance, and reproducible random-release rehearsals that verify each version against its own native ExifTool; this change activates reading only.

Validation against ExifTool 13.59 and Perl 5.38.2:

• Official two-tier regeneration: all 32 declared artifacts reproduce with no drift. 140 focused Python tests pass with zero skips, including mutations of the actual generated parent/child artifacts. Three public-reader tests, 55 IFD-reader tests, formatting and full Clippy pass.
• Exact public fixture replay: seven TIFF inputs, both display and numeric modes, 14 native invocations pass. The 67-file native/control/candidate comparison adds two correct rows and removes 40 extras, with no lost correct keys or real-file output changes.
• Fresh paired full corpus at runtime 3d0353f versus merged base 8887e5d: 4,238 files, 518,919 native tags, 468,087 correct rows in both builds, no meaningful per-file output changes, lost correct keys or crashes. The supervisor's exit 1 is retained for ExifTool's pre-existing empty-file diagnostic, independently reviewed; both OxiDex builds exit 0 on that input.
• Supported source change: rename AFInfo2 entry 8 only in a copied native source, run official regeneration, and rebuild without handwritten Rust/Python changes. Both byte orders and display/numeric output use the new name and preserve native values. Only established volatile file-access timestamps are excluded; original raw comparisons are retained.

Production source and Cargo files retain the accepted 3d0353f behavior; the only later Rust edit is within the legacy Canon test module. Its zero-size fixture now asserts native rejection and its positive case uses the correct size. The full local Cargo unit/integration/doc run passes with 5,993 passes, zero failures and 124 ignored tests in 150.641 seconds. The first hosted test failure and the unavailable local nextest executable remain recorded; hosted checks must pass on this repaired head. Independent whole-source review found no remaining blocker. Native warnings, broader occurrence/group fidelity and generated writing are not claimed by the bounded checks. Failed intermediate attempts and exact evidence identities are recorded in docs/reference/afinfo2-production-plan.md.

All five required hosted checks passed on 2630ded8; complete job logs are preserved with the checkpoint evidence.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-13T16:03:00.968261Z	2630ded	New commits

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[chatgpt-codex-connector]

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Reviewed commit: 2630ded84a

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[chatgpt-codex-connector]

Allow validator-free serial edges through verification

When an IFD SubDirectory targets an authenticated ProcessSerialData table but declares no Validate, codegen.py still emits processor: Serial with validation: None. Here validation_helper is necessarily None, so this unconditional helper check rejects the route and expected_ifd_edge instead expects Native/unwalked, causing the official verifier to reject its own freshly generated artifact. Require _u16_membership_helper only when the source edge actually has Validate.

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