skills: add execution agent dispatch protocol

skills/execution-agent-dispatch/README.md

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+# execution-agent-dispatch
+
+A lightweight skill for turning PM decisions into clear worker handoffs.
+
+## Why this exists
+
+It is not enough to have execution agents.
+They also need a consistent way to receive work and report results.
+
+Without that, the system drifts into familiar failure modes:
+- vague delegation
+- role boundary drift
+- workers doing too much or too little
+- silent blocking
+- messy result reporting
+
+This skill exists to standardize the handoff layer between **main** and execution agents.
+
+## What it standardizes
+
+- the task packet main sends to a worker
+- the result format a worker returns
+- when a worker must escalate instead of staying silent
+- milestone / ETA discipline for delegated work
+
+## Core idea
+
+A good worker handoff should answer:
+1. What exactly should be done?
+2. What is out of bounds?
+3. What does success look like?
+4. When should the worker report back?
+5. What should trigger escalation?
+
+## Recommended task packet
+
+- Task
+- Scope
+- Deliverable
+- Constraints
+- Milestone 1 + ETA
+
+## Recommended result packet
+
+- `status:` ok | blocked | failed
+- `changed:` ...
+- `notes:` ...
+- `next:` ...
+
+## Notes
+
+This is a dispatch / coordination skill, not an implementation skill.
+It works best after `execution-agent-planner` has already decided which workers should exist and what they should own.