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PKCE was advertised in the discovery document but not actually implemented. This commit adds full PKCE support: - Store code_challenge and code_challenge_method in authorization code JWT - Accept code_verifier parameter in token endpoint - Validate code_verifier against stored code_challenge - Support both S256 (SHA256) and plain code challenge methods - PKCE validation is required when code_challenge is present This prevents authorization code interception attacks by requiring the client to prove possession of the code_verifier that was used to generate the code_challenge.