feat(cli): add ao session resume

[Ayush7614]

Summary

• Add ao session resume <id> wrapping existing POST /sessions/{id}/resume-agent
• Desktop already uses this route; CLI could not resume without raw HTTP
• Includes --json and --project scope plus docs/table update

Test plan

• go test ./internal/cli/ -run TestSessionResume
• Manually: ao session resume <live-session-id> against a running daemon

[somewherelostt]

Thanks for contributing to Agent Orchestrator.

This PR is being picked up by the current external contributor on-call pair:

• @illegalcall
• @Pulkit7070

If someone is already working on this, please continue as usual.
The on-call pair is added for visibility, tracking, and support, not to take over the work.
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[Ayush7614]

cc: @illegalcall @Pulkit7070