docs: update pgpm init skills with --template, -t, -w, and -W flags

[pyramation]

Summary

Updates skill documentation to reflect new CLI flags added to pgpm init in constructive PR #674:

• --template, -t <path>: New flag that combines --dir and template type into a single path (e.g., pgpm init -t pnpm/module)
• --create-workspace, -w: Creates a workspace first, then creates the module inside it
• -W: Interactive workspace recovery prompt (when running pgpm init outside a workspace)
• Updated default folder references from default/ to pgpm/ to match boilerplates repo changes

Files updated:

• skills/pgpm-init/SKILL.md
• skills/pgpm-init-templates/SKILL.md
• skills/pgpm-cli/SKILL.md
• skills/pgpm-boilerplates/SKILL.md

Review & Testing Checklist for Human

• Verify the -w flag description matches actual CLI behavior (creates workspace first, then module inside it)
• Confirm -W vs -w distinction is accurate (lowercase creates workspace+module, uppercase is for interactive recovery prompt)
• Check that --template parsing description is correct (splits on first / to extract dir and type)

Recommended test plan:

# Verify these commands work as documented
pgpm init -t pnpm/module -w  # Should create workspace + module
pgpm init --template pgpm/workspace  # Should create PGPM workspace

Notes

This is a documentation-only change. The actual CLI implementation was merged in constructive-io/constructive#674.

Link to Devin run: https://app.devin.ai/sessions/86fc90000ad24b2cacf3b750dc077be3
Requested by: Dan Lynch (@pyramation)

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