Client identifier prefix detection by colon

Requirement as recorded in the ProtocolSoup registry

Wallets MUST use the presence of a ":" (colon) character and the content preceding it to determine whether a Client Identifier Prefix is used.

Self-test verdict

Tests

• TestParseClientIDSchemeUsesFinalPrefixFallback

  ./internal/protocols/oid4vp

  Pass
• TestInferClientIDSchemeUsesClientIDPrefixOnly

  ./cmd/walletharness

  Pass

Implementation

• backend/internal/protocols/oid4vp/contracts.go
• backend/cmd/walletharness/main.go

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