feat: add OpenAPI docs and opt-in bearer auth via env-var secret

Merge pull request #1 from abducodez/worktree-modal-init

Merge branch 'main' into worktree-modal-init

feat: add Modal model-serving layer, one app per provider

Refactor code structure for improved readability and maintainability

feat: phase 2 architecture — manifest system, structured output, salience memory, SQLite ledger, observer

feat: phase 1 — memory layer, governor, second scenario, 70 passing tests

feat: scaffold hackathon agent theater