Cletus plugin kit: rules for coding agents, specification, host API, style guide, worker SDK and cletus-plugin tool

sdk/cmd/cletus-plugin/template/AGENTS.md.tmpl

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+# Rules for coding agents
+
+This is a Cletus plugin. Before changing anything, read the plugin kit and
+follow its rules exactly:
+
+- Rules: https://git.eidonix.com/eidonix/cletus-plugins/src/branch/main/AGENTS.md
+- Specification: https://git.eidonix.com/eidonix/cletus-plugins/src/branch/main/docs/specification.md
+- Host API: https://git.eidonix.com/eidonix/cletus-plugins/src/branch/main/docs/host-api.md
+- Style guide: https://git.eidonix.com/eidonix/cletus-plugins/src/branch/main/docs/style-guide.md
+- Review checklist: https://git.eidonix.com/eidonix/cletus-plugins/src/branch/main/docs/review-checklist.md
+
+If you can't read them, stop and ask the user for a copy of the kit.
+
+Commands:
+
+    cletus-plugin check                  # must pass before you say you're done
+    cletus-plugin run tools              # list the chat tools
+    cletus-plugin run invoke <tool> '<json>'
+    go test ./...
+
+Keep docs/plan.md, plugin.json and CHANGELOG.md in step with the code.