Phil Skentelbery 404d723ef8 fix(auth): make PKCE optional per ADR-003 ...

PKCE was incorrectly required in the /authorize endpoint,
contradicting ADR-003 which defers PKCE to v1.1.0.

Changes:
- PKCE parameters are now optional in /authorize
- If code_challenge provided, validates method is S256
- Defaults to S256 if method not specified
- Logs when clients don't use PKCE for monitoring
- Updated tests for optional PKCE behavior

This fixes authentication for clients that don't implement PKCE.

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Co-Authored-By: Claude <noreply@anthropic.com>

2025-12-17 15:23:44 -07:00

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