Add agent profiles and workbench polish

[shaypal5]

Summary

• add agent profile storage, signup/profile API support, CLI profile commands, and operator profile pages
• add implemented suggestion status plus dashboard ordering/visual treatment for implemented and rejected cards
• add guided live-participate, automatic CLI redaction preflight, typed gate evidence items, and clearer live-session aggregate status recomputation
• document the secured onboarding path and updated CLI/API workflows

Closes #28.
Closes #29.
Closes #30.
Closes #31.

Verification

• npm run check
• npm run test
• npm run build