fix: cleanup README and focus on windows

02-advanced/04-bisect/README.md

@@ -74,7 +74,7 @@ Use bisect when:
 
 ## Useful Commands
 
-```bash
+```powershell
 # Start bisect session
 git bisect start
 
@@ -112,7 +112,7 @@ git bisect log
 
 Run the verification script to check your solution:
 
-```bash
+```powershell
 .\verify.ps1
 ```
 
@@ -152,7 +152,7 @@ The verification will check that:
 ## Manual vs Automated Bisect
 
 ### Manual Bisect
-```bash
+```powershell
 git bisect start
 git bisect bad
 git bisect good HEAD~20
@@ -165,7 +165,7 @@ git bisect reset
 ```
 
 ### Automated Bisect
-```bash
+```powershell
 git bisect start
 git bisect bad
 git bisect good HEAD~20
@@ -182,22 +182,28 @@ The test script should exit with:
 ## Bisect Workflow Example
 
 ### Finding a Performance Regression
-```bash
+```powershell
 # App is slow now, was fast 50 commits ago
 git bisect start
 git bisect bad
 git bisect good HEAD~50
 
 # Create test script
-echo '#!/bin/bash\ntime npm start | grep "Started in"' > test.sh
-chmod +x test.sh
+@'
+$output = npm start 2>&1 | Select-String "Started in"
+if ($output -match "Started in (\d+)") {
+  if ([int]$Matches[1] -gt 5000) { exit 1 } # Slow
+  else { exit 0 } # Fast
+}
+exit 1
+'@ | Out-File -FilePath test.ps1
 
-git bisect run ./test.sh
+git bisect run pwsh test.ps1
 # Git finds the commit that made it slow
 ```
 
 ### Finding When a Feature Broke
-```bash
+```powershell
 git bisect start
 git bisect bad
 git bisect good v1.0.0  # Last known good version