Add WAL process-kill crashpoints

[flyingrobots]

Closes #577

Summary

• Add wal_process_crashpoints in echo-dind-tests, using a parent/child test harness that kills child processes after committed WAL material and before transaction commit.
• Promote process.kill.after_wal_commit from future descriptor to ProcessKill execution posture in the WAL crashpoint manifest.
• Add the exact witness to durability-release and update WAL/workflow/changelog/hardening-matrix signposts.

Validation

• cargo test -p echo-dind-tests wal_process_crashpoints -- --nocapture
• cargo test -p warp-core --test causal_wal_hardening_tests crashpoint_manifest_marks_process_kill_as_available_runner
• cargo test -p xtask test_slice_durability_release_stays_explicit
• cargo clippy -p echo-dind-tests --all-targets -- -D warnings
• cargo clippy -p warp-core --test causal_wal_hardening_tests -- -D warnings
• cargo test -p echo-dind-tests
• cargo fmt --check
• npx markdownlint-cli2 CHANGELOG.md docs/topics/WAL.md docs/workflows.md docs/design/causal-wal-hardening-matrix.md
• git diff --check
• scripts/ban-nondeterminism.sh
• pre-commit hook: echo-dind-tests and warp-core clippy/check plus markdownlint
• pre-push hook: echo-dind-tests --lib, full causal_wal_hardening_tests, and markdown formatting

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 6ee30459-ede4-4001-b5c5-184b1f3ae932

📥 Commits

Reviewing files that changed from the base of the PR and between 8e89de4 and fe8c2f6.

📒 Files selected for processing (8)

• CHANGELOG.md
• crates/echo-dind-tests/src/lib.rs
• crates/warp-core/src/causal_wal.rs
• crates/warp-core/tests/causal_wal_hardening_tests.rs
• docs/design/causal-wal-hardening-matrix.md
• docs/topics/WAL.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/577-process-kill-crashpoint-runner

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[flyingrobots]

Code Lawyer update

Item	Status	Evidence	Resolving commit
#577 Process-Kill Crashpoint Runner	Resolved	wal_process_crashpoints kills child processes after committed WAL material and before transaction commit, then verifies recovery preserves committed history and excludes uncommitted tails.	fe8c2f6
Crashpoint manifest	Resolved	process.kill.after_wal_commit is now WalCrashpointExecution::ProcessKill; crashpoint_manifest_marks_process_kill_as_available_runner passed locally and in CI.	fe8c2f6
Release gate witness	Resolved	cargo test -p echo-dind-tests wal_process_crashpoints is wired into cargo xtask test-slice durability-release.	fe8c2f6
CI	Clean	36/36 PR checks passed, including CI, det-gates, Security Audit, SPDX Header Check, and Materialization Determinism.	fe8c2f6
Review threads	Clean	GraphQL reviewThreads.totalCount is 0; no requested-change reviews.	fe8c2f6
CodeRabbit	Clean	CodeRabbit status is SUCCESS; top-level note is only rate limit / credits, with no actionable review threads.	fe8c2f6