feat: vendorizar as 10 skills do pilar de seguranca em skills/

Copia local (nao fork, nao submodule) de safedeps, sca-audit,
secrets-scan, code-review-security, api-security-review,
web-security-review, cve-triage, patch-prioritization,
dependency-scanning e hermaguard -- commit exato de origem e licenca
de cada uma em skills/NOTICE.md. Elimina o passo de clone externo
pro pilar de seguranca do wf-security-review: git clone deste repo
ja traz tudo funcional.

Corrige tambem o comando de instalacao pro Claude Code nos dois
READMEs e no docs/SKILLS.md: Claude Code exige um diretorio por
skill (skills/<nome>/SKILL.md), nao aceita os .md soltos que o
comando antigo copiava -- confirmado testando a instalacao real.

skills/secrets-scan/SKILL.md

@@ -0,0 +1,40 @@
+---
+name: secrets-scan
+description: Detect hardcoded credentials, API keys, tokens, and secrets in source code and configuration files. Use when reviewing code for leaked secrets before commit/merge, auditing a repository for credential exposure, or setting up secret detection.
+license: CC-BY-4.0
+---
+
+# Secrets Scan
+
+Detect hardcoded secrets by following the full procedure in `plays/secrets-scan.md`.
+
+## Steps
+
+1. **Run Automated Scanner** — Use available tools in preference order:
+   - `trufflehog filesystem --directory=<path> --json` (recommended)
+   - `trufflehog git file://<repo> --json` (includes git history)
+   - `gitleaks detect --source=<path> --report-format=json`
+   - `detect-secrets scan <path> --all-files`
+   - If no scanner available, proceed with manual pattern analysis.
+
+2. **Manual Pattern Analysis** — Search for high-confidence patterns:
+   - AWS keys (`AKIA...`), OpenAI (`sk-...`), Anthropic (`sk-ant-...`), GitHub (`ghp_...`), Slack (`xoxb-...`), Stripe (`sk_live_...`), SendGrid (`SG.`)
+   - Connection strings with embedded passwords (`://user:pass@host`)
+   - Private keys (PEM headers), JWT secrets, database credentials
+   - High-risk files: `.env`, `docker-compose*.yml`, `*.tfvars`, `terraform.tfstate`, `kubeconfig`, `.npmrc`, `.pypirc`
+
+3. **Contextual Analysis** — For each detection: Is it real (not a placeholder/test fixture)? Is it active? What's the blast radius (service, permissions, prod vs dev, exposure duration)?
+
+4. **Check Preventive Controls** — Verify: `.gitignore` covers sensitive files, pre-commit hooks for secret scanning, CI pipeline scanning, secrets management documentation.
+
+**Important**: Never include actual secret values in findings. Show redacted versions only (e.g., `AKIA****EXAMPLE`). Active production secrets require immediate rotation.
+
+## Output
+
+Scan summary, findings using `templates/finding.md`, preventive controls checklist, and immediate rotation actions if needed.
+
+## OWASP References
+
+- A07:2021: Identification and Authentication Failures
+- CWE-798: Use of Hard-coded Credentials
+- CWE-312: Cleartext Storage of Sensitive Information