Expose decision-governed acting selection

[adrianwebb]

Outcome\n\nExpose exact decision/activity selection and native agent-team clone operations.\n\n## Work authority\n\n- Work item / Issue: treeseed-ai/platform#520\n- Proposal / decision: Golden proposal 4326e52f-e25b-407c-a1d3-1628601ec1d8 / decision d0def93c-29de-4096-909e-a7cc44c5858f\n- Assignment / checkpoint: workday-7f49152f-ae12-48bc-9531-dd13f9d6245a\n- Actor: Codex\n- Human authority: Platform #520 and direct operator instruction\n- Agent / capacity provider: provider_-rcKRK8gG2NGnOU3yGu_CV3Wz7ACppTP\n- Exact base ref: 8ad28d9\n- Exact head ref: bbb9718\n\n## Plan\n\nKeep one content authority, graph, assignment path, AgentKernel path, and result contract.\n\n## Changes and commits\n\nRegenerates CLI command schemas, reference, and shell completion from SDK descriptors.\n\n## Verification\n\n191 CLI tests, generated build, file-length, and architecture checks passed.\n\n## Risk and rollback\n\nGenerated surface requires matching SDK/API contracts. Revert this PR before those contracts.\n\n## Completion summary\n\nThe bounded repository change is implemented and locally verified; coordinated graph acceptance continues before release.\n\n## Submission checklist\n\n- [x] Agent-authored under human authority\n- [x] The change is bounded to the stated work item and target repository.\n- [x] Exact base and head refs are recorded and the branch is ready for review.\n- [x] Verification and compatibility evidence are recorded above.\n- [x] No plaintext secrets, credentials, machine state, or unrelated residue are included.\n- [x] Plan, status, commits, and completion summary form a complete durable record.\n- [x] Rollback or recovery steps are documented and executable.