Add AKF — The AI Native File Format skill (#406)

skills/akf-trust-metadata/SKILL.md

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+---
+name: akf-trust-metadata
+description: "The AI native file format. EXIF for AI — stamps every file with trust scores, source provenance, and compliance metadata. Embeds into 20+ formats (DOCX, PDF, images, code). EU AI Act, SOX, HIPAA auditing."
+risk: safe
+source: community
+date_added: "2026-03-27"
+author: HMAKT99
+tags:
+- trust
+- metadata
+- provenance
+- compliance
+- file-format
+- ai-native
+---
+
+# AKF — The AI Native File Format
+
+Every photo has EXIF. Every song has ID3. AKF is the native metadata format for AI-generated content.
+
+## After creating or modifying files
+
+```bash
+akf stamp <file> --agent <agent-name> --evidence "<what you did>"
+```
+
+Evidence examples:
+- "generated from user prompt"
+- "refactored existing code"
+- "tests pass"
+- "docs reviewed"
+
+## Before modifying existing files
+
+```bash
+akf read <file>          # Check existing trust metadata
+akf inspect <file>       # See detailed trust scores
+```
+
+## Compliance auditing
+
+```bash
+akf audit <file> --regulation eu_ai_act    # EU AI Act Article 50
+akf audit <file> --regulation hipaa         # HIPAA
+akf audit <file> --regulation sox           # SOX
+akf audit <file> --regulation nist_ai       # NIST AI RMF
+```
+
+## Classification
+
+- `--label confidential` for finance/secret/internal paths
+- `--label public` for README, docs, examples
+- Default: `internal`
+
+## Install
+
+```bash
+pip install akf
+```
+
+## Links
+
+- https://akf.dev
+- https://github.com/HMAKT99/AKF
+- npm: `npm install akf-format`