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.

hooks/lib/git-cmd.js

@@ -24,8 +24,7 @@
  * §4, epic #3212 Phase 3, #3414) — the built `msd-core/bin/lib/token-scanner.cjs`
  * artifact, not a sibling hooks/-tree file, because hook scripts are staged as
  * standalone files at install time and a sibling require is a staging
- * dependency that can fail silently (see msd-workflow-guard.js's own
- * KIMI_TOOL_NAMES comment for the precedent this follows). Re-exported here
+ * dependency that can fail silently. Re-exported here
  * unchanged — every existing caller's behavior is identical (parity-asserted
  * in tests/token-scanner.test.cjs row 5).
  */