Add agent-swarm skill

agent-swarm/assets/brief.md.tmpl

@@ -0,0 +1,45 @@
+# Swarm brief — {{TASK}}
+
+## Goal
+{{One paragraph. What must exist when the swarm is done.}}
+
+## Success criteria
+- [ ] {{Criterion}} — verified by {{check or command}}
+- [ ] {{Criterion}} — verified by {{check or command}}
+
+Scope is checked by the lead with the skill's `scripts/audit-scope.mjs`; workers do not run it.
+
+## Non-goals
+- {{What must not change or be attempted.}}
+
+## Stack and commands
+| Action | Command |
+|---|---|
+| build | `{{command}}` |
+| test | `{{command}}` |
+| lint | `{{command}}` |
+| run | `{{command}}` |
+
+## Repository map
+| Path | Role |
+|---|---|
+| `{{path}}` | {{one line}} |
+
+## Conventions and invariants
+- {{Naming, error handling, test style, formatting.}}
+- {{Data or API invariants that must not break.}}
+
+## Hazards
+- {{Generated files, migrations, flaky tests, shared ports, secrets, caches.}}
+- {{Generated or vendored paths that must not be edited.}}
+
+## Frozen contracts
+See `.swarm/contracts.md`. Do not change an interface without returning `blocked`.
+
+## Global forbidden actions
+- No installs, repo-wide format/lint/codegen, migrations, dev servers, or git writes.
+- No edits outside your task's write scope.
+- Do not edit `.swarm/brief.md`, `plan.*`, `contracts.md`, or another task's files or reports.
+
+## Reporting
+Write `.swarm/reports/{{ID}}.json` and return the same object. Use `.swarm/report.schema.json`.