# W14 — Test gate & conformance infrastructure loop

Forge agent **ws-W14**. Role: build out **W14** from the SX review remediation plan
(`plans/sx-review/PLAN.md`, §"W14. Test gate & conformance infrastructure") —
*the enabler that makes every other fix verifiable*. One checklist item per fire.

You are on branch `loops/sx-ws-w14`, worktree `/root/rose-ash-loops/sx-ws-w14`.

## Hard guardrails (read every fire)

- **TEST-ONLY.** No semantics edits. Do NOT touch `spec/evaluator.sx`,
  `spec/primitives.sx`, `spec/parser.sx`, `spec/render.sx`, the OCaml kernel,
  or any host runtime. W14 pins behavior with tests and productionizes the
  *test/runner* surface; the actual fixes are other workstreams (W1–W12).
  A pin that *fails* means the finding regressed — do NOT relax the assertion,
  record it as a blocker.
- **NO PUSH.** Commit locally on `loops/sx-ws-w14` only. Never push; never touch
  `main` or `architecture`.
- **`.sx` files: use `sx-tree` MCP tools only** (a hook blocks Read/Write/Edit
  on `.sx`). `sx_write_file` takes params **`file`** and **`source`** (NOT
  `content` — a wrong key yields a `yojson … got null` error and no write).
  `.md`/`.sh`/`.ml` files: normal tools are fine.
- **Never `pkill`/`kill` `sx_server`** — sibling loops share the binary. Bound
  every run with `timeout` (e.g. `timeout 300 …`); if it hangs, let the timeout end it.
- **One item per fire, then stop.** No batching.

## Per-iteration procedure

1. Pick the first unchecked `[ ]` in the checklist.
2. Implement (test file or runner/harness change), lifting minimal repros from
   the review lane files (`plans/sx-review/{core,hosts,conformance}.md`) — they
   are a ready-made corpus of confirmed reprs.
3. Build + run the affected tests:
   `sx_build` (target ocaml) then
   `timeout 300 ./hosts/ocaml/_build/default/bin/run_tests.exe <test-name>`
   to run a single file. New `spec/tests/test-*.sx` files are auto-discovered.
4. Confirm green (a pin must PASS on current HEAD — the fix already landed).
5. Commit locally: `git add -A && git commit` with a `W14:` prefix.
6. Tick the box, prepend one dated line to the Progress log, stop.

## Checklist

### A. Test-debt pins — dc7aa709's landed fixes shipped without regression tests
Pin each confirmed-and-fixed finding with a minimal repro. Add suites to
`spec/tests/test-gate-pins.sx` (one `defsuite` per finding).

- [x] K18 [W7] — `expt` overflow now float-promotes (no 63-bit wrap)
- [ ] K20 [W7] — identify the landed W7 fix and pin it
- [ ] K09/K11/K39 [W5] — landed special-form fixes, pin each
- [ ] K49 [W8] — render depth/cycle guard (infinite recursive component)
- [ ] crit-2 [W1] — signal-return frame key (verify the pin is non-vacuous)
- [ ] C1/C1b [W3] — HTTP-mode concurrency fixes, pin
- [ ] S4 [conformance] — housekeeping repro, pin

### B. Runner/production env unification
- [ ] Audit runner-only bindings (`values`/`call-with-values` F7/K42, JS
      fake sha3/equal?/apply/env-set! shims JS5) — inventory + failing pin
      that a fresh `sx_server` reproduces the drift

### C. Harness honesty
- [ ] K19 — MCP `mcp_tree.ml` harness primitive table drift vs `sx_primitives`
      (parity test)
- [ ] C22/K104 — harness logs IO *before* invoking the mock (throwing-mock pin)
- [ ] C21 — real perform/suspend mode in harness
- [ ] C23 — adapter-dom render-output tests

### D. WASM corpus runner
- [ ] F2 — promote conformance's `run_wasm.js` prototype into CI

### E. Epoch-loop protocol fuzz + skip-list
- [ ] C3/C4/C5/C6/C7 — epoch protocol fuzz suite
- [ ] F10 — hs-upstream skip-list so browser-only FAILs mean something
- [ ] C9 — empty suite label

### F. Differential battery
- [ ] F8 — cross-host differential battery (same source, all hosts agree)

## Progress log (newest first)

- 2026-07-03 — **K18 expt-overflow pin (item A.1)**. Bootstrapped this briefing
  from PLAN.md §W14 (the referenced file did not exist yet). Added
  `spec/tests/test-gate-pins.sx` with suite `gate-K18-expt-overflow` (4 tests):
  small exponents stay exact (`2^0=1`, `2^10=1024`), `2^62 > 0` (no negative
  63-bit wrap), `2^100 > 0` (no wrap-to-zero), `2^100` is a number (float
  promotion). Verified 4/4 green under the OCaml run_tests kernel. Test-only.

## Blocked
- (none)