feat(spec): add 003-autonomous-agent-control specification
Spec for full AI agent mobile control capability:
- Voice call control (dial/answer/hangup/status/list)
- App lifecycle management (install --url, update, permissions, grant, info)
- Device backup & restore (create/list/restore/app/verify, AES-256 encrypt)
- SMS send/delete + wait-reply via KDE Connect
- Audio control (volume/mute/route)
- Contacts management (list/add/export VCF)
56 tasks across 7 phases. TDD: fixtures → RED tests → GREEN impl.
Target: ≥130 BATS tests on completion.
Closes: specs/003-autonomous-agent-control/{spec,plan,tasks}.md