chore(worktrees): add installation

Amolith created

Change summary

README.md                                                     | 8 ++--
skills/managing-and-navigating-worktrees/SKILL.md             | 4 ++
skills/managing-and-navigating-worktrees/refs/installation.md | 4 ++
3 files changed, 12 insertions(+), 4 deletions(-)

Detailed changes

README.md 🔗

@@ -233,9 +233,9 @@ Token breakdown:
 Token breakdown:
   Name:           32 tokens
   Description:   110 tokens
-  Body:         1785 tokens (92 lines)
+  Body:         1912 tokens (96 lines)
   ───────────────────────────────────────────────
-  Total:        1927 tokens
+  Total:        2054 tokens
 
 === querying-documentation ===
 
@@ -308,8 +308,8 @@ SUMMARY
 
 Skills: 13
 Metadata: 1828 tokens
-Combined bodies: 20337 tokens
-Overall: 125814 tokens
+Combined bodies: 20464 tokens
+Overall: 125941 tokens
 Validation errors: 0
 
 Largest skills (by total tokens):

skills/managing-and-navigating-worktrees/SKILL.md 🔗

@@ -99,3 +99,7 @@ From project root, `wt a` skips hooks. From a worktree, hooks trigger.
 
 1. **Hooks only trigger from worktrees**: Running `wt a` from project root skips hooks
 2. **Branch paths**: `feature/foo` becomes `project/feature/foo` (nested) or `project_feature_foo` (flat, if configured)
+
+---
+
+See [refs/installation.md](refs/installation.md) if you try to use `wt` and it's not available. Do not reference this file until and unless you invoke `wt` and get some kind of command not found error.