Add canonical-code index integration, model-terminology audit, and canonicalization of symbolic tooling

[CAM-Initiative]

Motivation

• Replace and align legacy symbolic-structures index usage with the canonical code index and improve symbolic-lint robustness and CI compatibility.
• Provide a deterministic, repository-wide scan for model/sub-model terminology and emit a machine-readable audit for governance review.
• Regenerate governance index artifacts to reflect updated instrument metadata and newly-added Annex/Schedule records.

Description

• Point lint-symbolic-structures.py at the canonical index (.github/Indices/canonical-code-index.json), add --require-index/--require-registry flags, and make the tool tolerant of a missing legacy index while deriving validation from the canonical index when available.
• Extend update-CAM-BS2025-AEON-003-SCH-01.py to scan Governance/**/*.md for model terminology, classify terms via classify_model_term/classify_review_status, inject a model-register summary into SCH-01, and write a full audit file to .github/Indices/CAM.Governance.Model-Terminology.Audit.md.
• Add new/updated generated indices and documentation: canonical-code-index.json, canonical-code-index.md, the model terminology audit file, and update maintainer docs and workflows to use build-canonical-code-index.py in place of the old symbolic builder.
• Add automated tests for the linter and SCH-01 updater (.github/scripts/tests/test_lint_symbolic_structures.py and .github/scripts/tests/test_update_sch01_registry.py) and update multiple generated governance artifacts (Governance/CAM.Governance.JSON, CAM.Governance.Index.md, constitution/schedule files) to reflect refreshed metadata and new Annex/Schedule entries.

Testing

• Ran the script unit tests with python -m pytest .github/scripts/tests, and all tests passed.
• Executed the updated linter against the generated canonical index (python .github/scripts/lint-symbolic-structures.py --index .github/Indices/canonical-code-index.json) which completed without error in non-strict mode.
• Ran the registry updater (python .github/scripts/update-CAM-BS2025-AEON-003-SCH-01.py) to regenerate SCH-01 and confirmed the model summary block was inserted and the audit file .github/Indices/CAM.Governance.Model-Terminology.Audit.md was written.

---

Codex Task