feat(skills): add skills-perso skill to list personal skills

Lists all local skills from ~/.claude/skills/ with name and description,
excluding symlinked/external ones (gstack, emil-design-eng).

Co-Authored-By: Claude <noreply@anthropic.com>

skills/skills-perso/SKILL.md

@@ -0,0 +1,42 @@
+---
+name: skills-perso
+description: |
+  List all personal skills installed in ~/.claude/skills/.
+  Shows only local skills (excludes symlinked/external skills like gstack or emil-design-eng).
+  For each skill, displays its name and description from SKILL.md frontmatter.
+  Trigger: "skills-perso", "mes skills", "list my skills", "quels skills", "skills perso".
+argument-hint: ""
+disable-model-invocation: false
+allowed-tools:
+  - Bash
+  - Read
+  - Glob
+---
+
+# skills-perso
+
+List all personal skills from `~/.claude/skills/`, excluding symlinked/external directories.
+
+## Steps
+
+1. List all directories in `~/.claude/skills/` that are NOT symlinks (use `find ~/.claude/skills -maxdepth 1 -mindepth 1 -type d -not -type l | sort`).
+2. For each directory found, read the first 15 lines of `SKILL.md` if it exists.
+3. Extract `name` and `description` from the YAML frontmatter.
+4. Display a clean table with two columns: **Skill** and **Description** (first line of description only, trimmed).
+5. At the end, show the total count.
+
+## Output format
+
+```
+## Personal Skills (~/.claude/skills/)
+
+| Skill | Description |
+|-------|-------------|
+| feat  | Small feature implementation (1-5 files)... |
+| ...   | ... |
+
+**Total: N skills**
+```
+
+Keep descriptions to one line (~80 chars max, truncate with "..." if needed).
+Do NOT include symlinked directories (they point to external/shared skills).