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-label-policy.test.cjs

@@ -76,7 +76,6 @@ test('getRuntimeLabel fallback: unknown / empty / alias inputs return "Claude Co
 const NEW_PROJECT_OVERRIDES = {
   codex: '$msd-new-project',
   cursor: 'msd-new-project (mention the skill name)',
-  kimi: '/skill:msd-new-project',
 };
 const DEFAULT_CMD = '/msd-new-project';