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/model-catalog.cts

@@ -208,7 +208,7 @@ export const KNOWN_PROVIDERS: Set<string> = new Set(
 // Codex agent `.toml` `model`. Two forms: (a) a bare Claude Agent-tool tier alias
 // (opus/sonnet/haiku/fable — CLAUDE_AGENT_ALIASES below); (b) any Claude model id in
 // any provider namespacing — `claude-*`, `anthropic/claude-*`, `us.anthropic.claude-*`
-// (the forms the catalog assigns to opencode/hermes/kilo, reachable on a Codex .toml
+// (the forms the catalog assigns to opencode, reachable on a Codex .toml
 // via the runtime-resolver path). No OpenAI/Codex model id contains "claude", so a
 // case-insensitive substring test is a safe, exhaustive guard for (b). Codex/ChatGPT
 // rejects all of these.