Echo / git-warp witnessed suffix sync

[flyingrobots]

Migrated from Method backlog

This issue was created from a legacy filesystem backlog card. GitHub Issues are now the live work tracker; repository docs remain Method evidence.

Source backlog: docs/method/backlog/up-next/PLATFORM_echo-git-warp-witnessed-suffix-sync.md
Original lane: up-next
Original legend: PLATFORM

Original backlog card

Echo / git-warp witnessed suffix sync

• Lane: up-next
• Legend: PLATFORM
• Rank: 1

Why now

Echo now has honest publication for neighborhood and settlement runtime truth,
and Continuum has a cleaner "shared causal history, two temperatures" story.

What is still missing is the concrete handoff boundary:

• Echo should export witnessed causal suffixes
• Echo should import peer suffixes through normal admission
• hot/cold runtime handoff should not degrade into state synchronization
  folklore

Hill

Prove one honest Echo runtime path for:

• export_suffix(request) -> CausalSuffixBundle
• import_suffix(bundle) -> ImportSuffixResult

without last-write-wins, silent branch mutation, or looped re-import.

Done looks like

• one narrow bundle request shape exists over graph/lane/frontier identity
• one bundle export path gathers witnessed transitions plus payload references
• one import path normalizes against local frontier truth and returns:
  • admitted
  • staged
  • braided
  • conflict
  • obstructed
• one duplicate-import case proves idempotence
• one first peer proving target is named:
  • git-warp import of Echo-exported suffixes

Repo Evidence

• docs/design/0009-witnessed-causal-suffix-sync/design.md
• docs/design/0008-strand-settlement/design.md
• crates/warp-core/src/settlement.rs
• crates/warp-core/src/neighborhood.rs
• crates/echo-wasm-abi/src/kernel_port.rs
• crates/warp-wasm/src/warp_kernel.rs

[coderabbitai]

🔗 Related PRs

#322 - feat: add witnessed suffix admission shell skeleton [merged]
#323 - Witnessed suffix admission evaluator [merged]
#325 - Canonical witnessed suffix posture constructors [merged]
#329 - Stack Witness 0001 fixture-backed jedit walking skeleton [merged]
#358 - feat(core): add admission evidence boundaries [merged]

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