Reapply "Move superpowers plugin into plugins/superpowers-bootstrap subdirectory"

This reverts commit d6ac9a8b5d.

turns out this worked. it's just that anthropic changed claude's startup hook output

commands/README.md

@@ -1,36 +0,0 @@
-# Claude Commands
-
-Slash commands for Claude that reference skills.
-
-## Available Commands
-
-- `/brainstorm` - Interactive idea refinement using Socratic method (→ `@skills/collaboration/brainstorming/SKILL.md`)
-- `/write-plan` - Create detailed implementation plan (→ `@skills/collaboration/writing-plans/SKILL.md`)
-- `/execute-plan` - Execute plan in batches with review (→ `@skills/collaboration/executing-plans/SKILL.md`)
-
-## Format
-
-Each command is a simple markdown file containing a single `@` reference to a skill:
-
-```markdown
-@skills/collaboration/brainstorming/SKILL.md
-```
-
-When you run the command (e.g., `/brainstorm`), Claude loads and follows that skill.
-
-## Creating Custom Commands
-
-To add your own commands:
-
-1. Create `your-command.md` in this directory
-2. Add a single line referencing a skill:
-   ```markdown
-   @skills/your-category/your-skill/SKILL.md
-   ```
-3. The command `/your-command` is now available
-
-## Installation
-
-These commands are automatically symlinked to `~/.claude/commands/` by the clank installer.
-
-See `@skills/meta/installing-skills/SKILL.md` for installation details.

commands/brainstorm.md

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----
-description: Interactive design refinement using Socratic method
----
-
-Read and follow: ${SUPERPOWERS_SKILLS_ROOT}/skills/collaboration/brainstorming/SKILL.md

commands/execute-plan.md

@@ -1,5 +0,0 @@
----
-description: Execute plan in batches with review checkpoints
----
-
-Read and follow: ${SUPERPOWERS_SKILLS_ROOT}/skills/collaboration/executing-plans/SKILL.md

commands/write-plan.md

@@ -1,5 +0,0 @@
----
-description: Create detailed implementation plan with bite-sized tasks
----
-
-Read and follow: ${SUPERPOWERS_SKILLS_ROOT}/skills/collaboration/writing-plans/SKILL.md