docs: drop instruction file enumeration per PR #1121 review

Jesse flagged that the verbose CLAUDE.md/AGENTS.md/GEMINI.md/.cursorrules
enumeration (a) chews tokens, (b) confuses models that anchor on exact
strings, and (c) is repeated DRY-violatingly across 3+ locations.

Replace with abstract "your instructions" framing in four spots:
- skills/using-git-worktrees/SKILL.md Step 0 → Step 1 transition
- skills/using-git-worktrees/SKILL.md Step 1b Directory Selection
- docs/superpowers/plans/2026-04-06-worktree-rototill.md (both mirror locations)

Same intent, harness-agnostic phrasing, ~half the tokens.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/superpowers/plans/2026-04-06-worktree-rototill.md

@@ -251,7 +251,7 @@ Report with branch state:
 
 **If `GIT_DIR == GIT_COMMON` (or in a submodule):** You are in a normal repo checkout.
 
-If the user has not already made their preferences about worktree isolation clear — check global and project agent instruction files (`CLAUDE.md`, `AGENTS.md`, `GEMINI.md`, `.cursorrules`, or equivalent) — ask for consent before creating a worktree:
+Has the user already indicated their worktree preference in your instructions? If not, ask for consent before creating a worktree:
 
 > "Would you like me to set up an isolated worktree? It protects your current branch from changes."
 
@@ -289,7 +289,7 @@ Follow this priority order:
    ```
    If found, use it (backward compatibility with legacy global path).
 
-3. **Check your project's agent instruction file** (CLAUDE.md, GEMINI.md, AGENTS.md, .cursorrules, or equivalent) for a worktree directory preference. If specified, use it without asking.
+3. **Check your instructions for a worktree directory preference.** If specified, use it without asking.
 
 4. **Default to `.worktrees/`.**
 

skills/using-git-worktrees/SKILL.md

@@ -38,7 +38,7 @@ Report with branch state:
 
 **If `GIT_DIR == GIT_COMMON` (or in a submodule):** You are in a normal repo checkout.
 
-If the user has not already made their preferences about worktree isolation clear — check global and project agent instruction files (`CLAUDE.md`, `AGENTS.md`, `GEMINI.md`, `.cursorrules`, or equivalent) — ask for consent before creating a worktree:
+Has the user already indicated their worktree preference in your instructions? If not, ask for consent before creating a worktree:
 
 > "Would you like me to set up an isolated worktree? It protects your current branch from changes."
 
@@ -64,7 +64,7 @@ Only proceed to Step 1b if you have no native worktree tool available.
 
 Follow this priority order. Explicit user preference always beats observed filesystem state.
 
-1. **Check global and project agent instruction files** (`~/.claude/CLAUDE.md`, `~/.config/gemini/AGENTS.md`, project-level `CLAUDE.md`, `AGENTS.md`, `GEMINI.md`, `.cursorrules`, or equivalent) for a declared worktree directory preference. If specified, use it without asking.
+1. **Check your instructions for a declared worktree directory preference.** If the user has already specified one, use it without asking.
 
 2. **Check for an existing project-local worktree directory:**
    ```bash