Add dispatch checklist and failure template

skills/execution-agent-dispatch/FAILURE_TEMPLATE.md

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+# Delegation Failure Template
+
+Use this when a delegated task did not truly start, stalled, or was misreported.
+
+## Minimal internal record
+- Task:
+- Intended worker(s):
+- State when failure recognized:
+- Failure type: `launch failure` | `stalled` | `model` | `auth` | `tool` | `path/repo` | `scope` | `policy/review` | `external`
+- Evidence present:
+- Evidence missing:
+- User-visible impact:
+- Correct next state:
+- Prevention rule:
+
+## Minimal Tao update
+- who:
+- status:
+- output:
+- next:
+
+## Example: launch failure
+- who: `data_worker`
+- status: blocked — launch failure
+- output: dispatch was attempted, but no worker session evidence / milestone / artifact appeared within the launch window
+- next: mark this worker blocked, stop claiming progress, and either retry explicitly or revise the plan
+
+## Example: main misreporting failure
+- who: main
+- status: failed — reporting/process failure
+- output: main reported progress without execution evidence from the delegated worker
+- next: correct state to `dispatching` or `blocked`, notify Tao, and tighten the evidence gate before future dispatches