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/review-lane-invocation.cts

@@ -10,7 +10,7 @@
  * replaces is the simple system that worked, and every leg encodes a hard-won fix — #2494 and #2605
  * (empty output), #1698 (Codex stdout teardown noise), #1936 (OpenCode zero-output turns), #2073
  * (Antigravity's three modes), #2176 (repo-root anchoring), #2589 (no jq on stock Windows), #2794
- * (Qwen's missing sidecar). A resolver designed from the descriptor TYPES would throw that away and
+ * (a missing sidecar). A resolver designed from the descriptor TYPES would throw that away and
  * rebuild the bugs. So each lane's plan was derived from its leg, and `tests/review-lane-invocation`
  * asserts all twelve against a frozen table. Old and new cannot literally run in parallel, so that
  * table is the strangler-fig substitute — it is what makes this cutover safe rather than hopeful.
@@ -361,7 +361,7 @@ export function nativeTimeoutToken(timeoutMs: number): string {
  *
  * WHITESPACE-ONLY COUNTS AS EMPTY, for every lane. The bash tested `[ ! -s file ]`, which counts
  * BYTES — so a reply of three spaces passed as a successful review. Two legs (LM Studio,
- * llama.cpp) closed this locally with a case-glob; gemini, claude, codex, qwen and cursor did not.
+ * llama.cpp) closed this locally with a case-glob; gemini, claude, codex and cursor did not.
  * Making it uniform is a deliberate, disclosed behavior change (a bug fix that breaks a workaround)
  * and is why this phase ships a changeset note.
  *