feat: Align open-backup with @hasna/contracts

[andrei-hasna]

Objective

Align open-backup with @hasna/contracts

Run the @hasna/contracts conformance check for this repo and fix every violation until it passes — ensure a valid hasna.contract.json, published_artifact_gate satisfied (artifact-scan wired into prepack), storage waiver where applicable, and all required metadata/scripts present. Keep changes minimal and conformant. Open a PR; do not merge.

Verification

• policy source: base 8ce32b1 (immutable commit — agent-proof)
• ⚠️ GATE-INTEGRITY: agent touched verify-bearing config — REVIEW (scripts.build, scripts.check, scripts.contracts:conformance, scripts.prepack, scripts.scan:artifact)
• install: pass
• typecheck: pass
• build: pass
• test: pass

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Run run_c687bb2de0d1 · backend codewith · task 146852a5-48e3-4f6a-9a59-19ea811fa305
🏭 Generated by @hasnaxyz/factory

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[andrei-hasna]

Adversarial review: REJECT

Reviewed at head b4a03f1. Verdict: REJECT — the conformance pass rests on a waiver, and the artifact gate is a wiring check, not a measurement. It also does not merge.

1. It cannot merge as-is

gh pr view 20 --json mergeable,mergeStateStatus
{"mergeStateStatus":"DIRTY","mergeable":"CONFLICTING"}

Base 8ce32b1 is 1 commit behind main (d32e5cb = #21), which also edits package.json. Needs a rebase before anything else.

2. The postgres violation was waived, not fixed

hasna.contract.json adds metadata.conformance.waivedStorageEngines for postgres. That waiver is load-bearing — removing only that block and re-running the same command:

contracts repo-conformance .   # RC=1
fail manifest_valid: storage.engines cli-with-store storage.engines must declare both
sqlite and postgres unless the engine carries a metadata.conformance.waivedStorageEngines
waiver; missing: postgres

So contracts:conformance passes because of the exemption entry, not because the requirement is met. Two further problems with the waiver as written:

• The manifest declares "deploymentModes": ["local", "self_hosted"], but the waiver's stated reason is "without a serve binary or cloud runtime placement". A contract that claims self_hosted while waiving the engine that self_hosted implies is internally inconsistent. Either drop self_hosted from deploymentModes or declare postgres.
• "reviewedBy": "platform-storage" is unvalidated free text — the gate does not check it (I substituted a nonsense reviewer name and only the expiry check fired). As written this is a self-granted waiver carrying an attestation the tooling cannot verify. If it stands, it needs a real named reviewer who actually signed off.

Credit where due: waiver expiry is enforced (expiresAt in the past → fail storage_capabilities: storage waiver for postgres expired).

3. published_artifact_gate is satisfied by wiring, not by execution

pass published_artifact_gate: prepack reaches the declared packed-artifact scan 'scan:artifact'

Repointing the script at a file that does not exist — "scan:artifact": "bun scripts/THIS-FILE-DOES-NOT-EXIST.ts" — still yields RC=0 and the same pass. The gate confirms the script is named by prepack and present in package.json (deleting the script entry does correctly fail it), but it never runs the scan, so it cannot distinguish a working scanner from an inert one. This PR's artifact-safety claim is therefore unproven by the gate it cites.

There is a further, more serious problem with what contracts artifact-scan actually detects when it is run. Because this repo is public I am not putting the specifics here — filed internally, and I will raise it against @hasna/contracts directly.

4. Coverage narrowed in tests/mcp.test.ts

The stdio test was renamed from "responds to initialize over stdio before stdin closes" to "responds to initialize over stdio", and rewritten from a streaming reader to spawnSync with input, which closes stdin immediately. The original test's specific guarantee — a response arrives before EOF — is no longer asserted, so a regression where the server only flushes on stdin close would now pass. The new expect(result.stderr).toBe("") and expect(result.status).toBe(0) assertions are a genuine improvement; please keep those and restore the before-EOF guarantee.

Nits

• "@hasna/contracts": "0.8.1" exact-pinned (good).
• scripts/scan-artifact.ts correctly hard-errors when the packed artifact is missing/ambiguous (Expected exactly one packed artifact) — that part is right.
• contracts:conformance changed target from conformance examples to repo-conformance .; that is the correct command, but it means the previous examples validation no longer runs anywhere. Confirm that was intended.

[andrei-hasna]

Addendum — the stale base is not cosmetic: it would un-build the preservation guard

The single merge conflict is one hunk in package.json, on the build script. main (#21) added src/preservation.ts to the build entry list; this branch predates it and adds --external @hasna/contracts to the older list. Extracting the entry lists from each side:

modules on main's build list that pr20's build list would DROP:
  src/preservation.ts

src/preservation.ts is the 240-line module #21 introduced to refuse to prune preservation-marked archives. Resolving this conflict in the branch's favour therefore ships a dist/ with the preservation guard not built — while contracts:conformance, bun test and published_artifact_gate all still report green, because none of them check that the build list covers src/.

Given this repo guards last-copy archives, that is the most consequential item in this review. Please rebase onto d32e5cb and resolve by taking main's entry list plus the --external @hasna/contracts flags, then re-run.

Worth considering as a follow-up: the build entry list is a hand-maintained enumeration of src/*.ts, which is exactly why this drift is invisible. A glob, or a conformance check asserting every top-level src/*.ts is either built or explicitly excluded, would make this class of regression impossible rather than merely caught.

Reproduction:

git checkout -B mt20 main && git merge --no-ff pr20   # RC=1, CONFLICT in package.json
git diff --name-only --diff-filter=U                  # package.json  (sole conflict)