feat(evidence): keep embedded image URIs as positional non-lexical units

[seonghobae]

Summary

#37–#57 remain review-blocked (no independent APPROVE). #37 and #45 kept ready. Next no-0008 gap: embedded data:image units in existing evidence_core (independent of #56).

• Locate data:image/<type>;base64,... and keep the original source span
• Recover media type image/png from a known URI
• Refuse using that payload as lexical inference text

Test plan

• RED: embedded_image_contract failed with E0432/E0599
• cargo test -p evidence_core --offline
• cargo clippy -p evidence_core --all-targets --offline -- -D warnings
• python3 scripts/validate_documentation.py and check_docstrings.py
• exact-head required Checks (do not treat queued evidence as passed)

Do not self-approve or merge. Prefer merge #37 then #45 when eligible. Do not allocate 0008.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 1e4e27b5-1f91-43d2-ac3b-552c8ed0ec13

📥 Commits

Reviewing files that changed from the base of the PR and between b2a3f87 and e60de27.

📒 Files selected for processing (10)

• CHANGELOG.md
• DOCUMENTATION.md
• crates/evidence_core/src/error.rs
• crates/evidence_core/src/image_unit.rs
• crates/evidence_core/src/lib.rs
• crates/evidence_core/tests/embedded_image_contract.rs
• crates/evidence_core/tests/records_and_spans_contract.rs
• docs/TRACEABILITY.md
• docs/research/embedded-image-units.md
• docs/validation/temporal-event-foundation.md

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