[agent] fix(subagents): require progress evidence and support reconciled task recovery

[thisisjun786]

Closes #178.

An executor can keep investigating while its working tree stays clean. The old waiting guidance treated repeated empty waits as failure. It also lacked an executable recovery path when a child stopped after confirmed stagnation or unusable output without a provider error.

The waiting reference now requires meaningful progress comparisons and a delivered checkpoint before declaring stagnation. It distinguishes missing visibility, final-output failure, cancellation, and resource limits, and requires prior work to stop before handoff.

Managed dispatch adds outcome: "task_failed" for confirmed stagnation or unusable_output. It validates bounded evidence, the recorded child ID, stopped execution, and reconciliation before reusing the existing two-attempt handoff. A returned ready still requires a fresh claim; only main-direct permits main to reclaim work. Provider error precedence and terminal stop decisions remain intact. The CLI guidance, plan template, architect recovery clause, public guide, and doctrine agree on these permissions.

Verification for cb25e3b1:

• Build: 181 files compiled and layout validated; generated output matches source.
• Full root suite: 3,165 total, 3,091 passed, 74 skipped, 0 failed. Locked dependencies and an isolated TMPDIR resolved local environment failures without product changes.
• Focused dispatch and separate-process CLI regressions: 38 passed, 0 failed; the original task-failure regression was observed failing before implementation.
• Real compiled root CLI: 35 captured invocations covering recovery, persistence, duplicate claims, invalid evidence, live children, and stop precedence.
• Gate, inventory, and whitespace checks passed. Independent source and final-record reviews found no substantive issues.
• Linux, Windows, and macOS CI passed. Automatic GitHub code review completed on this head with no new findings; all four earlier review threads are resolved. The separate package and install checks also passed on every configured platform.

Progress classification and child-shutdown evidence remain main-agent judgments; this does not add a runtime watchdog or authenticated termination receipts. No plugin installation, merge, or release is part of this PR.

Verification record.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-15T08:52:29.686423Z	cb25e3b	New commits
🔒 Security Review	✅ Completed 2026-09-14T20:18:52.883870Z	3767ae8	PR opened

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[thisisjun786]

Superseded by #180. The replacement retains this PR's evidence-based retirement guidance, explicit task-failure recovery and resolved review fixes. Its recovery runtime is carried unchanged.

The combined change strengthens architect consultation while preserving CXC's existing delegation-selection rules and independent review. Live-child reconciliation and stop rules still apply. This PR is closed in favor of the single replacement; the original branch and contribution history remain preserved.