ℹ️ No critical issues — one test-coverage suggestion.

Reviewed changes — RFC 6901-encodes JSON Pointer reference tokens in toJSONSchema when the schema's .meta({ id }) contains ~ or /, fixing #6027.

• Add encodeRefToken helper — encodes ~ → ~0 and / → ~1 for JSON Pointer reference tokens in extractDefs.
• Apply encoding in both ref paths — the self-contained #/$defs/... ref path and the external #/__shared/... registry ref path are both updated. The $defs object key remains the original unencoded id.

ℹ️ Missing test coverage for the fix

This is a bug fix for an observable behavior regression (invalid $ref pointers when id contains / or ~), but no test is added. No existing test exercises an id with these characters, so the fix has zero coverage.

# Missing test coverage for the fix

## Affected sites
- `packages/zod/src/v4/core/to-json-schema.ts:266` — `__shared` path uses `encodeRefToken(id)`
- `packages/zod/src/v4/core/to-json-schema.ts:277` — self-contained ref path uses `encodeRefToken(defId)`

## Required outcome
- Add at least one test that verifies `$ref` tokens are encoded when the schema `id` contains `/` and/or `~`, for both the self-contained and external-registry paths. The inline snapshot tests in `to-json-schema.test.ts` are a good fit.

## Suggested approach
A lightweight inline snapshot test covering both characters together:

```ts
test("ref tokens are RFC 6901 encoded when id contains / or ~", () => {
  const inner = z.string().meta({ id: "Shared/User~" });
  const result = z.toJSONSchema(z.object({ a: inner }));
  expect(result.$defs!["Shared/User~"]).toEqual({ type: "string" });
  expect((result.properties!.a as any).$ref).toBe("#/$defs/Shared~1User~0");
});
```

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✅ No new issues found.

Reviewed changes — added the test-coverage suggested in the prior review, plus an inline comment noting the RFC 6901 encoding.

• Added test for RFC 6901 encoding — to-json-schema.test.ts now exercises the $ref token encoding when .meta({ id }) contains / and ~, verifying both the $defs key and the encoded $ref path.

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Reviewed changes — the latest commit attempted to remove an extra blank line in the test file, but introduced file corruption in the process.

• BOM character added — to-json-schema.test.ts now starts with a UTF-8 BOM (EF BB BF), which can cause issues with toolchains, linters, and source-map processors.
• Emdash corrupted — the — on line 2177 was replaced with the mojibake sequence 鈥?.
• Core fix unchanged — the encodeRefToken implementation in to-json-schema.ts is correct and unchanged from the prior review.

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Reviewed changes — the latest commit attempted to fix the BOM/emdash corruption flagged in the prior review but instead nuked the file.

• Deleted entire test file — 72e8e988 removed all 3140 lines of to-json-schema.test.ts, leaving it empty (0 lines, 0 bytes). The to-json-schema.ts core fix is correct and unchanged.

🚨 to-json-schema.test.ts has been deleted

Commit 72e8e988 (fix: remove extra blank line in test file) emptied the test file instead of stripping the BOM and restoring the corrupted emdash. The working tree now has zero content in that file — all existing toJSONSchema test coverage and the newly added RFC 6901 encoding test are gone.

# to-json-schema.test.ts has been deleted

## Affected sites
- `packages/zod/src/v4/classic/tests/to-json-schema.test.ts` — 0 lines, 0 bytes (was 3140 lines). The empty blob is `e69de29b`.

## Required outcome
- Restore `to-json-schema.test.ts` to its state at commit `9598525a` (the last working version with the correct RFC 6901 test and no BOM/corruption). That is: `git checkout 9598525a -- packages/zod/src/v4/classic/tests/to-json-schema.test.ts` then commit that as the fix.

## Suggested approach
Checkout the file from the last known-good state and commit it cleanly — no need to manually reconstruct anything.

```bash
git checkout 9598525a -- packages/zod/src/v4/classic/tests/to-json-schema.test.ts
git commit -m "fix: restore test file deleted by previous commit"
```

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Reviewed changes — commit 2ffa0dbd restored to-json-schema.test.ts after it was deleted in the prior commit.

• Restored to-json-schema.test.ts — the file is back as a proper 3131-line UTF-8 file with no BOM. The encodeRefToken core fix in to-json-schema.ts is correct and unchanged.

⚠️ RFC 6901 encoding test is missing

The file was restored from the base branch rather than from commit 9598525a, so the test that was explicitly added for this fix is gone. The encodeRefToken helper has no test coverage.

# RFC 6901 encoding test is missing

## Affected sites
- `packages/zod/src/v4/classic/tests/to-json-schema.test.ts` — the test added in `9598525a` (which exercised `encodeRefToken` with `Shared/User~` → `Shared~1User~0`) is absent.

## Required outcome
- Add the RFC 6901 encoding test back. The test from `9598525a` is:

```ts
test("ref tokens are RFC 6901 encoded when id contains / or ~", () => {
  const inner = z.string().meta({ id: "Shared/User~" });
  const result = z.toJSONSchema(z.object({ a: inner }));
  expect(result.$defs!["Shared/User~"]).toEqual({ type: "string" });
  expect((result.properties!.a as any).$ref).toBe("#/$defs/Shared~1User~0");
});
```

## Suggested approach
Add the test block after the other `toJSONSchema` tests — the core fix is already in place; only the test is missing.

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