refactor: drop 12 runtimes, keep Claude, Codex, OpenCode, Cursor, ZCode, Antigravity

Removes kilo, kimi, kimi-code, copilot, windsurf, augment, trae, qwen, hermes,
cline, codebuddy and pi end to end: capability descriptors, installer branches
and converters (bin/install.js 14.9k -> 11.2k lines), TypeScript converters,
hook surfaces and runtime homes, review lanes qwen/kimi-code, the two pi
migrations, Kimi payload normalization in the hook guards, dead hostBehaviors
vocabulary, launcher home probes, fixtures, runtime-specific tests and the
prose that presented them as supported.

Installer output for the six kept runtimes is byte-identical to before the
prune. The Kimi tool-vocabulary tests in workflow-guard, read-guard and
read-injection-scanner are left in place pending a decision.

hooks/msd-check-update.js

@@ -31,7 +31,7 @@ try {
 const homeDir = os.homedir();
 const cwd = process.cwd();
 
-// Detect runtime config directory (supports Claude, OpenCode, Kilo, Gemini)
+// Detect runtime config directory (supports Claude, OpenCode, Gemini)
 // Respects CLAUDE_CONFIG_DIR for custom config directory setups
 function detectConfigDir(baseDir) {
   // Check env override first (supports multi-account setups)
@@ -39,7 +39,7 @@ function detectConfigDir(baseDir) {
   if (envDir && fs.existsSync(path.join(envDir, 'msd-core', 'VERSION'))) {
     return envDir;
   }
-  for (const dir of ['.claude', '.gemini', '.config/kilo', '.kilo', '.config/opencode', '.opencode']) {
+  for (const dir of ['.claude', '.gemini', '.config/opencode', '.opencode']) {
     if (fs.existsSync(path.join(baseDir, dir, 'msd-core', 'VERSION'))) {
       return path.join(baseDir, dir);
     }