feat: add the dev-router, lean-code, bugfix/refactor workflows and agents

Every workflow used to run all of its phases for any request, so a one-line
fix paid the cost of a feature. dev-router classifies the request into tiers
0-3 with security triggers that raise the tier, and picks the workflow,
agents and gate tier. Agents get only the tools their role needs.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

.claude-plugin/marketplace.json

@@ -1,5 +1,6 @@
 {
   "name": "dev-workflows",
+  "description": "Dev workflows como plugin do Claude Code: roteador por nível, agentes, gate de qualidade e revisão de segurança.",
   "owner": {
     "name": "Evandro Fonseca Junior",
     "url": "https://github.com/evandrodevbr"