After PR4 every JWT must carry wid (workspace_id). decode_token now
returns the new TokenError.WORKSPACE_MISSING when the signature is
valid but the payload lacks wid; expired tokens still report EXPIRED
first so /auth/refresh logic stays correct. AuthErrorCode gains a
matching WORKSPACE_REQUIRED for middleware to surface to clients.
Updates 13 existing test sites that issued tokens without wid to pass
workspace_id="ws-test" + role="owner", reflecting the new contract.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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