feat(warp-core): define WSC causal history export profiles

[flyingrobots]

Summary

• add a versioned WSC causal-history export profile model
• define evidence requirements for ref-only, self-contained, and CAS-addressed profiles
• make CAS-addressed exports explicit byte-retention references, not causal authority claims

Closes #563.

Validation

• cargo test -p warp-core wsc_causal_history_export_profiles
• cargo test -p warp-core --test wsc_store_tests
• cargo clippy -p warp-core --lib --test wsc_store_tests -- -D warnings
• cargo check -p warp-core
• cargo fmt --check
• git diff --check
• npx markdownlint-cli2 CHANGELOG.md
• pre-commit hook: cargo clippy -p warp-core --lib; cargo check -p warp-core; markdownlint CHANGELOG.md
• pre-push hook: cargo fmt --all -- --check; cargo check -p warp-core --quiet; cargo test -p warp-core --test wsc_store_tests; prettier touched markdown

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 40cf6c86-eb8e-4874-9ef3-618c4976db35

📥 Commits

Reviewing files that changed from the base of the PR and between ea0e914 and 1c1ec7c.

📒 Files selected for processing (4)

• CHANGELOG.md
• crates/warp-core/src/wsc/mod.rs
• crates/warp-core/src/wsc/store.rs
• crates/warp-core/tests/wsc_store_tests.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cycle/563-wsc-causal-history-export-profiles

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