fix(engine): restore missing export brace and drop unresolvable node:util import

[JSONbored]

Summary

• `packages/gittensory-engine/src/index.ts`: PR feat(miner-discovery): goal model — translate MinerGoalSpec into ranker weights #2787's inserted export block landed between PR feat(miner): add governor event ledger schema and writer #2795's export block and its own body, eating the opening `export {` for the `contributor-fit.js` re-export. This is a hard TS1005/TS1109 syntax error that currently breaks `npm run typecheck` (and therefore `npm run test:ci`) on `main` for everyone.
• `packages/gittensory-engine/src/governor-ledger.ts`: imports `isDeepStrictEqual` from `node:util`, but this package's `tsconfig.json` deliberately sets `types: []` (keeping Node ambient types out of its public `.d.ts` surface for downstream consumers), so the module's type declarations never resolve — `npm run build:miner` fails with TS2307. Replaced with a small local structural-equality check scoped to the JSON-safe values this one call site (`serializePayload`, already `v8 ignore`d) actually compares.

Scope

• Two-line + one-block fix, both within `packages/gittensory-engine/src`
• No behavior change outside restoring the intended pre-splice export list and pre-feat(miner): add governor event ledger schema and writer #2795-regression compile state

Validation

• `npm run typecheck` (repo root) — clean
• `npm run build:miner` (repo root) — clean
• `npm test` inside `packages/gittensory-engine` — 70/70 passing (was failing to even build before this fix)

Safety

• No secrets/wallets/hotkeys/trust-scores/reward values touched
• No public API surface change (same exports, same names)

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	gittensory-ui	857dcd8	Commit Preview URL Branch Preview URL	Jul 03 2026, 11:29 PM