Add typed canonical identity payloads, derived-alias lifecycle and projection validation

[mikemol]

Motivation

• Enforce a single, well-validated canonical identity representation at the boundary to avoid dual-shape ambiguity in core flows.
• Attach explicit lifecycle metadata to derived identity adapters so temporary alias adapters are auditable and can be deprecated safely.
• Harden projection contracts and validation so derived projections cannot silently violate expected adapter/projection invariants.

Description

• Introduces CanonicalAspfPathPayload, DerivedIdentityAdapterLifecycle, DerivedIdentityProjection, DerivedAliasPayload, ProjectionContract, ProjectionSlot, and ProjectionBinding dataclasses and helpers in src/gabion/analysis/evidence_keys.py to reify canonical identity payloads and derived-alias lifecycle.
• Reworks FingerprintIdentityLayers to use typed payloads, adds validate(), _projection_for_slot(), derived_aliases() and strict contract validation via PROJECTION_CONTRACTS.
• Updates fingerprint_identity_layers() to construct typed layers, add adapter lifecycle metadata and run validation before emission, and changes type_fingerprints.fingerprint_identity_payload() to emit derived aliases via the new helper.
• Adds normalization/validation for suite_site_endpoints and other canonical identity invariants and adds the meta_reify_structural_homology_plan.md documentation and expanded docs/aspf_taint_isomorphism_no_change.yaml justification text; updates out/test_evidence.json and updates/extends unit tests in tests/test_aspf_cofibration_laws.py, tests/test_fingerprint_soundness.py, and tests/test_type_fingerprints_sidecar.py to assert lifecycle fields and validation behavior.

Testing

• Ran targeted pytest for the modified tests including tests/test_aspf_cofibration_laws.py, tests/test_fingerprint_soundness.py, and tests/test_type_fingerprints_sidecar.py.
• Confirmed the updated identity-layer emission and projection-contract guards by asserting adapter lifecycle fields and that invalid canonical payload shapes raise the expected NeverThrown invariants.
• Regenerated evidence artifacts (out/test_evidence.json) to include new test function sites and mappings; the updated tests passed in the local test run.

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Codex Task