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/runtime-homes.property.test.cjs

@@ -175,10 +175,10 @@ const { getDirName } = require(
 );
 
 // Runtimes whose _applyRuntimeRewrites branch performs real path rewrites
-// (~/.claude/ → pathPrefix). copilot/antigravity only do attribution; claude
-// and the gemini/kilo family are omitted to keep the property on the path axis
+// (~/.claude/ → pathPrefix). antigravity only does attribution; claude
+// and the gemini family are omitted to keep the property on the path axis
 // the issue names. getDirName(`.${rt}`) == `.${rt}` for every entry here.
-const PATH_REWRITE_RUNTIMES = ['codex', 'cline', 'cursor', 'windsurf', 'augment', 'trae', 'codebuddy'];
+const PATH_REWRITE_RUNTIMES = ['codex', 'cursor'];
 
 const HOMES = ['/home/u', '/Users/x', '/root', '/srv/app', '/a'];
 const SEG = fc.stringMatching(/^[a-z][a-z0-9]{0,8}$/);