Ownership and Planned Files

• scripts/harness-checkpoint/contract.mjs — envelope, canonical JSON, ids, digests, anchors, and exact validation contract.
• scripts/harness-checkpoint/references.mjs — workspace reference and topology-root/target refs and canonical containment.
• scripts/harness-checkpoint/state-root.mjs — cross-platform Better Harness user-state resolution; no worktree writes.
• scripts/harness-checkpoint/catalog.mjs — fixed record, cursor, bounded tail reads, append/fsync, and diagnostics.
• scripts/harness-checkpoint/store.mjs — scoped envelope paths, atomic create, direct read, and catalog composition.
• scripts/harness-checkpoint/index.mjs — substrate exports only; no native artifact knowledge.
• scripts/harness-analysis/checkpoint-adapter.mjs — closed intake table, topology/target binding, native validator dispatch, anchors, byte validation, and learning-context resolution.
• scripts/harness-analysis/fluency-dimensions.mjs — existing owner of the imported Agent Work Loop model/contract constants; no checkpoint logic.
• scripts/harness-analysis/checkpoint-cli.mjs — parsing, help, human output, and JSON over the analysis adapter.
• scripts/better-harness-cli/registry.mjs — metadata-only advanced command.
• scripts/workspace-topology/index.mjs — existing public topology resolver and target contract used without duplicating monorepo logic.
• scripts/session-analysis/index.mjs and selection-plan.mjs — public I/O-free profile/snapshot/pair validation added beside existing readers.
• scripts/harness-analysis/learning-capture-state.mjs and scripts/harness-analysis/task-loop-source.mjs — explicit consumer option.
• docs/ARCHITECTURE.md — under ## Directory Conventions, add a checkpoint ownership bullet immediately before the existing scripts/plugin-lifecycle/ bullet: substrate scope, its six files, its single index, analysis adapter/CLI ownership, and the one-way dependency rule above.
• docs/docs/concepts/harness-run-checkpoints.md and docs/docs/troubleshooting.md — after behavior exists, document the advanced CLI, its non-restore boundary, stale-artifact failures, platform namespace, and the Qoder-only legacy fallback limitation from HRC-AC-16.

Contributor and agent routing is fixed:

Change	Owner / required version
Envelope/reference/store mechanics	scripts/harness-checkpoint/
Intake, native artifact, anchors, or learning continuity	scripts/harness-analysis/checkpoint-adapter.mjs
Root command behavior	scripts/harness-analysis/checkpoint-cli.mjs plus metadata registry
New host	Existing scripts/host-support/ admission only; no checkpoint storage metadata
New artifact kind, anchor kind, or resume capability	A reviewed V2 spec before implementation
Legacy/no-option learning behavior	scripts/harness-analysis/learning-capture-state.mjs
Any anchor, summary-count, or capabilities change	Update adapter reconstruction, substrate structural derivation, the Derived fields table, validation sequence, and cross-layer equality fixture together