Add ref-only WAL WSC export

[flyingrobots]

Summary

• add ref-only WAL WSC export/import helpers that compose projection graph, accepted-submission, and receipt-correlation WSC envelopes
• report external segment bytes as explicit ref-only dependencies while normalizing absolute locator paths out of causal identity
• add the filesystem-backed witness wsc_ref_only_export_preserves_wal_identity

Closes #564.

Validation

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

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: f5ea20f4-8c2c-499c-9141-e1088a15eb3c

📥 Commits

Reviewing files that changed from the base of the PR and between 5adc944 and 0faa1c1.

📒 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/causal_wal_tests.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cycle/564-ref-only-wsc-export-fixture

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