Function validateC2paInitSegment

validateC2paInitSegment(bytes: Uint8Array): Promise<InitSegmentValidation>
Validates a C2PA init segment: parses the manifest, extracts and verifies the certificate, validates the BMFF hard binding hash, verifies all session keys from the c2pa.session-keys assertion, and performs manifest integrity checks (assertion hashes, missing assertions, action ingredients, and claim signature verification).

Only session keys with a valid signer binding and an unexpired validity period are included in the result.
Parameters
- bytes: Uint8Array
  Raw init segment bytes
Returns Promise<InitSegmentValidation>
Structured validation result (with INIT_INVALID error code if mdat box is present)
Throws
If no C2PA UUID box is found
Example
```
it('throws for empty bytes (no C2PA UUID box)', async () => {
	await rejects(
		() => validateC2paInitSegment(new Uint8Array(0)),
		/No C2PA UUID box/,
	)
})
```
- Defined in init/validateC2paInitSegment.ts:206