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.

tests/hooks-commonjs-marker.test.cjs

@@ -1,6 +1,6 @@
 'use strict';
 
-// Regression tests for #2717: cursor, windsurf, and codex stage `.js` hook
+// Regression tests for #2717: cursor and codex stage `.js` hook
 // scripts via dedicated paths that bypass installSharedHooksBundle (the only
 // writer of the {"type":"commonjs"} marker). Under a config root declaring
 // {"type":"module"}, Node loaded those scripts as ESM and every require() failed
@@ -23,11 +23,10 @@ const { STAGED_HOOK_SCRIPT_TIMEOUT_MS } = require('./helpers/timeouts.cjs');
 
 const COMMONJS_MARKER = '{"type":"commonjs"}\n';
 
-// Runtimes that stage `.js` hooks via the dedicated cursor/windsurf/codex paths
-// (skipSharedHooksInstall or the !isCodex gate) — the three #2717 covers.
+// Runtimes that stage `.js` hooks via the dedicated cursor/codex paths
+// (skipSharedHooksInstall or the !isCodex gate) — the two #2717 covers.
 const AFFECTED_RUNTIMES = [
   { runtime: 'cursor', sampleHook: 'msd-cursor-session-start.js' },
-  { runtime: 'windsurf', sampleHook: 'msd-windsurf-pre-write.js' },
   { runtime: 'codex', sampleHook: 'msd-check-update.js' },
 ];