[luhpaco]

What changed

The code map (/mission code) looked for Chrome only at the macOS app path, so on Linux it always showed "needs Google Chrome". It now uses the first browser that exists in a fixed list.

 renderMap
-  if !exists(CHROME_MACOS) → error
+  chrome = first existing of
+    /Applications/Google Chrome.app/…   (macOS, unchanged first)
+    /usr/bin/google-chrome-stable
+    /usr/bin/google-chrome
+    /usr/bin/chromium-browser
+    /usr/bin/chromium
+  if !chrome → error listing those paths
   sh -c <unchanged headless script> chrome …

If the browser exists but the render fails (for example a Snap launcher), the pane said "Drawing the code map…" forever. It now says which browser failed:

   r = sh -c <headless script> chrome …
-  if r.exitCode == 0 → show frame
+  if r.exitCode == 0 → show frame, return
+  error = "<chrome> could not draw the code map."

docs/mods.md now says the Code view runs on macOS and Linux.

Evidence

• Before: on Fedora 44 with chromium-browser installed, the pane shows "The code map needs Google Chrome at /Applications/Google Chrome.app/…". The new test fails:
  given only /usr/bin/chromium-browser exists → expect sh run with that path ✗
  given chromium-browser exists but the render exits 1 → expect "could not draw" text ✗
• After: both new tests pass (claude plugin test mods/mission-control: 10 pass, 0 fail). The mod's own headless script, run by hand with /usr/bin/chromium-browser, wrote a 400×200 PNG and exited 0 with no Chrome left running.

Merge Danger

Door: two-way

Blast Radius: mission-control

macOS keeps the same path, checked first, so nothing changes there. The paths are a hard-coded list passed as an argv element ("$1"), not taken from env or user input. A Flatpak or Snap Chrome isn't picked up: its sandbox can't read the SVG in $TMPDIR.

Checklist

• claude plugin validate mods/mission-control passes
• claude plugin test mods/mission-control passes
• Changed a mod: version bumped in its plugin.json and in .claude-plugin/marketplace.json (0.1.3 → 0.1.4)
• New mod: entry in .claude-plugin/marketplace.json (n/a)
• New mod: README table row and docs/mods.md notes (n/a)