feat(claude): add scaffolding and validation skills

.claude/skills/new-fish-function/SKILL.md

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+---
+name: new-fish-function
+description: >-
+  Scaffold a new fish function in config/fish/functions/
+  with proper conventions and event handling.
+user-invocable: true
+allowed-tools: Bash, Read, Write, Edit
+---
+
+When creating a new fish function in `config/fish/functions/`:
+
+## 1. Create the function file
+
+Create `config/fish/functions/<name>.fish`:
+
+```fish
+function <name> --description '<one-line description>'
+  # Function logic here
+end
+```
+
+- One function per file, filename must match function name
+- Always include `--description`
+- Use `--argument-names` for named parameters
+
+## 2. Conventions
+
+- Do NOT use `_tide_` prefix (reserved for tide prompt plugin)
+- Use `--wraps` if the function wraps an existing command
+- For abbreviation-like functions, prefer fish abbreviations
+  in `config/fish/alias.fish` instead
+
+## 3. Validate
+
+Run the fish-validate skill checks:
+
+```bash
+fish --no-execute config/fish/functions/<name>.fish
+fish_indent --check config/fish/functions/<name>.fish
+```