test: pin flashstack-stx-core/sbtc-core against deployed source (ajv.2.4 axis 2)

[unixwhisperer]

Summary

Closes the ajv.2.4 "axis 2" gap (repo copy vs. deployed mainnet source, as opposed to axis 1 which is repo-internal canonical-vs-test-copy drift, already guarded) for the two live cores I independently reviewed under ajv.4.3.

Extends tests/deployed-source-pins.test.ts (already used for the two gen-1 receiver contracts) with byte-count + sha256 pins for flashstack-stx-core.clar and flashstack-sbtc-core.clar, checked byte-for-byte against the deployed source at SP20XD46NGAX05ZQZDKFYCCX49A3852BQABNP0VG5 on 2026-10-01 (fresh GET /v2/contracts/source fetch, cross-checked against the vendored .cache/requirements copy — identical apart from a trailing newline).

Why this design, not a live-fetch CI job

The bead's existing notes on ajv.2.4 flag that a true "fetch on every CI run and diff" guard makes the merge gate depend on a third-party API and network access, and explicitly leave the blocking-vs-scheduled-job call as yours to make. Rather than pick that for you, I extended the pattern this repo already uses for exactly this kind of invariant (the gen-1 receiver pins): an offline hash pin, verified against the chain once and re-verified by running the documented curl | shasum command. Zero network dependency in CI, same drift-catching guarantee for these two files, no architecture decision forced.

Verification

• Pins pass green against the current repo copies.
• Proven red: appended a byte to flashstack-stx-core.clar, pin failed (size changed: expected 6562 to be 6538); reverted, passes again.
• Full suite: 258 passed, 3 skipped (unchanged skip set) / 261 total across 25 files — no regressions.

Related

• ajv.4.3 (closed this session): independent review of both cores' deployed source — no fund-safety exploit found, D1 fidelity re-confirmed.
• ajv.2.4: this PR closes axis 2 for these two contracts specifically; the repo-wide live-fetch question (scheduled job) is still open, as noted above.

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[mattglory]

Approving, with two pushes already on this branch — one real catch, one my own mistake along the way, both worth you seeing.

Verified independently before accepting the hashes. Fetched both deployed sources fresh and hashed them myself. sbtc-core matched exactly. stx-core didn't: the deployed source is 6537 bytes, the repo's canonical contracts/flashstack-stx-core.clar was 6538 — one extra trailing newline, confirmed as committed content (git show HEAD), not a working-tree artifact. contracts/test/flashstack-stx-core.clar carried the identical extra byte, so canonical-copy-drift.test.ts's blank-line normalization never saw it — real drift, the exact shape this test's own docstring cites F-7 for, that the pin recorded as "verified" rather than caught.

efe21c6 fixed the test copy and the pin but not the canonical file — my own mistake: a mutation-test cleanup (git checkout -- on a deliberately-appended byte) ran before the trim on that file was committed, so it silently reverted to the original broken state instead of the fix. Caught by re-checking git show HEAD's byte count after pushing rather than trusting the earlier green run. 24817e7 actually fixes it: canonical file now genuinely 6537 bytes, sha256 re-verified against chain a second time.

Mutation-checked the corrected pin: appending a byte fails with the expected size-mismatch message, reverting passes again. Suite 260 passed / 1 expected fail (261), up from 258/259 by exactly your two pins. clarinet check 211/0. canonical-copy-drift and mainnet-fidelity both still green with the trimmed files. Dependency Audit is red here only because this branch predates #77/#80 (unrelated next/brace-expansion fixes already on main) — not a required check, will clear once this merges past them.

The design (offline pin, re-verify command, explicit note on why not a live-fetch CI job) is right, same as your reasoning on the original two receivers.