Bug Report: Streaming endpoint rejects wallet vouchers with invalid signature error

[protocolwhisper]

Current Behavior

Both metered/streaming routes reject vouchers produced by the standard wallet:

HTTP 402 {"error":"[invalid-signature] [REDACTED_STANDARD] vouchers require a [REDACTED_LENGTH] ECDSA signature"}

Context

• The CLI issues [REDACTED_KEY_TYPE] access keys by default.
• The session protocol ([REDACTED_VERSION], escrow [REDACTED_ADDRESS]) requires a [REDACTED_CURVE] ECDSA voucher.
• The charge endpoint (POST /[REDACTED_ENDPOINT]) processes payment successfully, so this appears isolated to intent=session.

Expected Behavior

Streaming routes should accept vouchers from the standard wallet, or documentation should clarify the required key format.

Steps to Reproduce

1. Generate an access key via the standard CLI.
2. Attempt to pay for a streaming/metered product.
3. Observe HTTP 402 on streaming routes while the charge endpoint succeeds.