fix(plugins): Add cross-platform hook wrappers for Windows compatibility

[yuribodo]

Summary

• Add polyglot .cmd wrappers to 3 official plugins (explanatory-output-style, learning-output-style, ralph-wiggum) that ensure hook .sh scripts execute correctly on Windows when WSL is installed
• Update hooks.json in each plugin to route through the wrapper instead of calling .sh scripts directly
• Document the pattern in plugin-dev skill (SKILL.md, patterns.md) with a copyable example for plugin developers

Problem

On Windows with WSL installed (extremely common due to Docker Desktop), bash in PATH resolves to C:\Windows\System32\bash.exe (WSL) instead of Git Bash. Claude Code detects .sh in hook commands and auto-prepends bash, causing all plugin hooks to fail:

WSL ERROR: CreateProcessCommon: execvpe(/bin/bash) failed: No such file or directory

Claude Code correctly identifies Git Bash at startup (Using bash path: "C:\Program Files\Git\bin\bash.exe") but uses generic bash for hook execution.

Solution

A polyglot .cmd file that works in both cmd.exe and bash:

• Lines starting with :; are labels in cmd.exe (ignored) and no-ops in bash
• Bash path: execs the target .sh script natively
• cmd.exe path: explicitly invokes Git Bash at standard installation paths with fallback discovery via where git

No changes to the core binary needed. Existing .sh scripts remain unchanged.

Test Plan

• Run each .cmd wrapper via cmd /c on Windows — produces valid JSON output
• Run each .cmd wrapper via bash on Unix-like shell — passes through correctly
• Verify no behavior change for existing Unix/macOS users (polyglot passthrough)
• Start Claude Code with the modified plugins — no SessionStart hook error

References

• Fixes [BUG] Windows: Hook .sh auto-detection resolves to WSL bash.exe instead of Git Bash when WSL is installed #23556
• Related: [Windows] Hook execution uses 'bash' instead of detected full path, fails when Git\bin not in PATH #22700 (bash not in PATH), [BUG] Plugin SessionStart hook fails on Windows (hook script never executes) #21468 (superpowers fails on Windows)
• Related: PR fix(ralph-wiggum): Add Windows compatibility for stop hook #19084 (ralph-wiggum .cmd wrapper — narrow scope, same approach)

[TStepOne]

👍

[mrmrcode]

Appreciate the effort

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