refactor: move SKILL.md to src, add playwriter skill command

- Move skills/playwriter/SKILL.md to playwriter/src/skill.md (source of truth)
- Add 'playwriter skill' CLI command to output full docs
- Make skills/playwriter/SKILL.md a lightweight stub pointing to CLI
- Generate prompt.md to dist/ instead of src/
- Strip CLI-only content from MCP prompt

.gitignore

@@ -13,7 +13,6 @@ playwriter/src/assets/*.png
 playwriter/src/assets/framer.html
 *-snapshot.txt
 claude-extension
-src/prompt.md
 
 # opensrc - source code for packages
 opensrc/
@@ -21,6 +20,3 @@ opensrc/
 # aria snapshots
 playwriter/src/aria-snapshots/
 playwriter/src/snapshots/
-
-# generated from skills/playwriter/SKILL.md
-playwriter/src/prompt.md