[GP1-S3] Filesystem Runtime WAL Failure Atomicity

[flyingrobots]

Roadmap slice: GP1-S3
Goalpost: Goalpost 1: Durable Runtime WAL Join
Parent: #521
Related: #510, #518

Source: docs/design/wal-wsc-durability-roadmap.md on branch cycle/521-wal-wsc-storage-relationship at bde7957c.

Scope

Parent issues:
#510,
#518.

Scope:

• Inject filesystem WAL append/flush/manifest failures around submission and
  tick boundaries.
• Prove failed WAL commits roll back app-visible submission intake or tick
  outcome publication.

Acceptance:

• A failed pre-ACK submission WAL commit leaves no witnessed submission visible.
• A failed scheduler tick WAL commit leaves no receipt correlation or applied
  outcome visible.
• Multi-head tick failure rolls back every tick record from the attempted
  scheduler pass.

Witness:

cargo test -p warp-core --features "native_rule_bootstrap trusted_runtime host_test" --test trusted_runtime_host_loop_tests filesystem_runtime_wal_failure

Dedupe note

This is the PR-sized implementation slice for the roadmap item above. Existing umbrella or adjacent issues remain linked as Parent/Related rather than duplicated here.

[coderabbitai]

🔗 Related PRs

#298 - feat(warp-core): TTD domain logic — provenance storage + causal cone walk [merged]
#360 - feat(core): stage ticketed ingress and outcome observation [merged]
#368 - feat(core): connect installed contract intent pipeline [merged]
#379 - feat(core): commit runtime WAL ACK evidence [merged]
#550 - Expose braid membership history [merged]

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