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.

docs/TESTING-SUITES.md

@@ -327,8 +327,8 @@ Every `run-tests.cjs` invocation snapshots MSD's own install footprint in each
 live runtime config directory before the suite and re-checks it afterwards. It
 exists because the failure it catches is silent by construction: a test that
 resolves a config directory from the ambient environment instead of a sandbox
-writes into *your real* `~/.claude` (or `$MSD_HOME/.msd`, or a Kimi
-`config.toml`), and nothing reports it. CI cannot catch this class at all —
+writes into *your real* `~/.claude` (or `$MSD_HOME/.msd`, or a runtime's
+config file), and nothing reports it. CI cannot catch this class at all —
 CI never has `CLAUDE_CONFIG_DIR` and friends set.
 
 The guard watches only what MSD unambiguously owns — its top-level install