fix(init): prefer linking existing project before create (2.4.9)

[jeffdi]

Summary

• update cf init to prompt link-existing vs create-new (default to linking existing)
• add explicit confirmation before creating a new platform project
• fix shuttle sorting when tapeout_date is null, and add regression tests

Test plan

• Verify lint diagnostics for edited files are clean
• Run pytest tests/test_init_command.py in a fully provisioned env (local run here blocked by missing paramiko)
• Install branch build via pip and manually test cf init interactive flow

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