refactor(skills): cut the workflows to ~100 lines and scale phases by tier

Each workflow was ~300 lines of grep-count "VERIFICAR" steps and ran every
phase for every request. Phases now state their minimum tier, checks are the
quality gate plus real tools, detail moved to references/, and machine-specific
paths and non-public skills are gone. Security references move to OWASP Top
10:2025, ASVS 5.0 and the OWASP LLM Top 10.

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

skills/lean-code/SKILL.md

@@ -1,6 +1,11 @@
 ---
 name: lean-code
 description: Use sempre que for escrever ou mudar código. Escolhe a menor solução que resolve de verdade - reaproveitar antes de escrever, apagar antes de somar, sem abstração especulativa e sem dependência desnecessária.
+license: MIT
+metadata:
+  dev-workflows:
+    uses: [safedeps]
+    external: []
 ---
 
 # Lean Code