Fix build:readme sed -i incompatibility on macOS

macOS sed requires a backup extension argument with -i, unlike GNU sed.
Use a temp file + mv instead for cross-platform compatibility.

https://claude.ai/code/session_01JCmVVCvBbxPUrxy3BcgjCc

Author: claude

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Bridge ignores stored OAuth access token when no refresh token is provided; servers that don't issue refresh tokens now work correctly by using the access token as a static Bearer header
+- `build:readme` script failing on macOS due to `sed -i` platform difference
 - Session incorrectly marked as `unauthorized` when access token expires but refresh token is still valid; bridge now attempts token refresh before giving up
 - "ESC to detach" hint now shows immediately in the spinner when using `--task`, instead of waiting for the server to return a task ID
 

scripts/update-readme.sh

@@ -66,7 +66,8 @@ echo "  Done"
 echo "Updating table of contents..."
 doctoc "$README" --github --notitle --maxlevel 2
 # Remove mcpc: entries from TOC (internal anchors that shouldn't be in TOC)
-sed -i '/^- \[mcpc:/d' "$README"
+# Use temp file for cross-platform compatibility (macOS sed -i requires different syntax)
+sed '/^- \[mcpc:/d' "$README" > "$README.tmp" && mv "$README.tmp" "$README"
 echo "  Done"
 
 # Step 3: Check for broken internal links