feat(xtask): add durable runtime WAL gate

[flyingrobots]

Summary

• Add cargo xtask test-slice durable-runtime-wal as the release-grade filesystem runtime WAL durability gate.
• Keep runtime-wal-ack documented as the fast semantic gate.
• Document the slice in the workflow guide, current bearing, and changelog.

Closes #558.

Validation

• cargo test -p xtask test_slice_durable_runtime_wal_stays_explicit
• cargo test -p xtask runtime_wal_ack_stale_claims
• cargo xtask test-slice durable-runtime-wal --dry-run
• cargo xtask test-slice durable-runtime-wal
• cargo xtask test-slice runtime-wal-ack
• cargo fmt --check
• cargo clippy -p xtask -- -D warnings
• npx markdownlint-cli2 CHANGELOG.md docs/BEARING.md docs/workflows.md
• git diff --check

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: bce8ba67-5fe4-4d09-bea9-f3305e5c35c3

📥 Commits

Reviewing files that changed from the base of the PR and between f25a7ec and 50acfd4.

📒 Files selected for processing (4)

• CHANGELOG.md
• docs/BEARING.md
• docs/workflows.md
• xtask/src/main.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cycle/558-durable-runtime-wal-gate

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