style: apply AGENTS.md rules to .pi markdown files

Replace em dashes with colons in tdd skill. Split combined\nshell commands in git skill into separate fenced blocks with\nlabels.

.pi/skills/git/SKILL.md

@@ -73,8 +73,15 @@ feat: add timer — it's fast     # em dash not allowed
 
 ## Committing
 
+Stage changes:
+
 ```sh
 git add -A
+```
+
+Commit:
+
+```sh
 git commit -m "type: subject"
 ```
 
@@ -93,8 +100,15 @@ This project uses semantic versioning for template releases.
 
 ### Creating a tag
 
+Create the tag:
+
 ```sh
 git tag -a v0.1.0 -m "Release v0.1.0"
+```
+
+Push the tag:
+
+```sh
 git push origin v0.1.0
 ```
 
@@ -124,8 +138,15 @@ git tag -l
 
 ### Deleting a tag
 
+Delete the local tag:
+
 ```sh
 git tag -d v0.1.0
+```
+
+Remove the remote tag:
+
+```sh
 git push origin --delete v0.1.0
 ```
 

.pi/skills/tdd/SKILL.md

@@ -25,9 +25,9 @@ description: Test-driven development with Unity and CMock. Use when adding new
 
 Every change to `<src>/` follows this cycle:
 
-1. **RED** — Write a failing test. Confirm it fails.
+1. **RED** : Write a failing test. Confirm it fails.
-2. **GREEN** — Write the minimum code to pass. Confirm it passes.
+2. **GREEN** : Write the minimum code to pass. Confirm it passes.
-3. **REFACTOR** — Clean up without changing behavior. Tests still pass.
+3. **REFACTOR** : Clean up without changing behavior. Tests still pass.
 
 Never skip the RED step. If the test passes immediately, you wrote the test
 before the implementation was missing.