fix(zod): generate z.union([z.instanceof(Blob), z.instanceof(File)]) for binary format

[j-ibarra]

Summary

Fields with format: 'binary' (produced e.g. by contentMediaType: 'application/octet-stream' in OpenAPI 3.1, as emitted by FastAPI ≥ 0.129.1) were generating z.string() in all three Zod plugin variants (v3, v4, mini) because the formatNode switch had no 'binary' case.

This PR adds the missing case to produce z.union([z.instanceof(Blob), z.instanceof(File)]), which mirrors what the TypeScript plugin already generates (Blob | File) and correctly validates file upload fields at runtime.

Before:

publicKey: z.string()

After:

publicKey: z.union([z.instanceof(Blob), z.instanceof(File)])

Changes

• constants.ts — add instanceof identifier
• v3/toAst/string.ts — add 'binary' case to formatNode
• v4/toAst/string.ts — add 'binary' case to formatNode
• mini/toAst/string.ts — add 'binary' case to formatNode

Related issues

• Fixes [ZOD] Incorrect schema creation for binary files #2317 — [ZOD] Incorrect schema creation for binary files
• Relates to Export binary string OpenAPI types using z.file() in zod v4 #2446 — Export binary string types using z.file() in zod v4. This PR uses z.instanceof(Blob/File) instead of z.file() because it works uniformly across all three Zod plugin variants (v3, v4, mini). A follow-up could add z.file() specifically for the v4 variant if desired.
• Relates to contentMediaType schema property not generating Blob | File` for multipart/form-data uploads #3408 — contentMediaType schema property not generating Blob | File. The TypeScript side was fixed by fix: generate Blob | File for contentMediaType schema property in OpenAPI 3.1 #3431; this PR completes the fix for the Zod plugin side.
• Overlaps with fix(plugins/zod): fix support for string types in binary format #1616 — fix(plugins/zod): fix support for string types in binary format. Similar fix, but this PR is based on the current main, covers all three Zod variants (v3, v4, mini), and includes updated snapshot tests.

Test plan

• All existing tests pass across @test/openapi-ts, @test/openapi-ts-zod-v3, and @test/openapi-ts-zod-v4
• Snapshot tests added for content-binary.json + zod and content-media-type.yaml + zod
• All zod snapshots (v3, v4, mini × OpenAPI 2.0.x, 3.0.x, 3.1.x) updated to reflect z.instanceof(Blob/File) for binary fields
• Builds clean for all three Zod plugin variants

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commit: c75e017

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.98%. Comparing base (c3e497c) to head (c75e017).

Files with missing lines	Patch %	Lines
...ages/openapi-ts/src/plugins/zod/v3/toAst/string.ts	0.00%	4 Missing ⚠️
...es/openapi-ts/src/plugins/zod/mini/toAst/string.ts	0.00%	2 Missing ⚠️
...ages/openapi-ts/src/plugins/zod/v4/toAst/string.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3627      +/-   ##
==========================================
- Coverage   38.99%   38.98%   -0.02%     
==========================================
  Files         513      513              
  Lines       18768    18775       +7     
  Branches     5565     5562       -3     
==========================================
  Hits         7319     7319              
- Misses       9252     9259       +7     
  Partials     2197     2197              

Flag	Coverage Δ
unittests	38.98% <0.00%> (-0.02%)	⬇️

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[j-ibarra]

@mrlubos can you check this please!