fix(memory): guard chunk tag rewrites

[senamakel]

Summary

Move OpenHuman’s chunk tag body-integrity invariant into TinyCortex so tag-only front-matter rewrites cannot silently mutate persisted markdown bodies. Add regression coverage for malformed front matter, valid front-matter-only changes, and body drift.

API Or Behavior Changes

update_chunk_tags now fails before replacing a file when the rewritten markdown cannot be parsed or its body differs from the original. No public API changes.

Tests

• cargo fmt --check
• cargo clippy --all-targets -- -D warnings
• cargo build --all-targets
• cargo test (1234 unit tests, integration tests, and doc tests passed)

Documentation

N/A: the public API is unchanged; the added invariant is documented next to the implementation.

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📥 Commits

Reviewing files that changed from the base of the PR and between 108b8e0 and e0a8738.

📒 Files selected for processing (2)

• src/memory/store/content/tags.rs
• src/memory/store/content/tags_tests.rs

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