Fix funding section: replace stale program deadlines with verified current status

SSI Fellowship 2025/26 cycle is closed — moved to Oct 2026 watch.
CZI EOSS Cycle 6 closed Oct 2023, no new cycle announced — flagged clearly.
BioHackathon Europe 2026 project call opens ~June 2026, not "now."
Wellcome Open Research Fund references removed (permanently closed 2021).
Added verification disclaimer to funding section header and Appendix URLs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aivuk