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/autonomous-converge.test.cjs

@@ -188,7 +188,6 @@ describe('autonomous --converge flag (#711)', () => {
     // They must now be DERIVED at runtime via `msd_run review-lane flags`, not listed.
     const formerlyHardcodedLaneFlags = [
       '--codex',
-      '--qwen',
       '--claude',
       '--opencode',
       '--ollama',