Add agent-workflow skill skeleton

skills/agent-workflow/references/reporting.md

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+# Reporting templates
+
+## Worker -> main
+- status: accepted | blocked | milestone | done | failed
+- summary: one-line result
+- evidence: commit / PR / log / session trace
+- risk: blocker or caveat
+- next: recommended next action
+
+## Main -> user
+- who
+- status
+- output
+- next
+
+## Examples
+
+### launch failure
+- who: qa_worker
+- status: blocked (launch failure)
+- output: dispatch accepted but no worker trace/session history appeared
+- next: re-dispatch or switch worker
+
+### milestone
+- who: promo_worker
+- status: in_progress
+- output: README links added and release draft created
+- next: review and merge remaining repo updates