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.

src/runtime-artifact-install-plan.cts

@@ -20,7 +20,7 @@ const { tryWithinRootLexical } = _require('./security.cjs') as typeof import('./
 // projection is centralized rather than eliminated).
 import { isGlobalScope, type InstallScope } from './install-scope.cjs';
 
-type ArtifactKindName = 'commands' | 'agents' | 'skills' | 'kimi-agents';
+type ArtifactKindName = 'commands' | 'agents' | 'skills';
 
 interface ResolvedProfile {
   name?: string;
@@ -248,7 +248,7 @@ function createRuntimeArtifactInstallPlan(args: CreateRuntimeArtifactInstallPlan
       if (kind.kind === 'commands') {
         const rewrittenDir = rewriteStagedCommandBodies(stagedDir, rewriteOpts);
         sourceDir = addCleanupDir(cleanupDirs, stagedDir, rewrittenDir);
-      } else if (kind.kind === 'skills' || kind.kind === 'kimi-agents') {
+      } else if (kind.kind === 'skills') {
         const rewrittenDir = rewriteStagedSkillBodies(stagedDir, rewriteOpts);
         sourceDir = addCleanupDir(cleanupDirs, stagedDir, rewrittenDir);
       }