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.

scripts/lib/macos-conformance-tier.generated.cjs

@@ -38,7 +38,6 @@ module.exports = {
   "tests/chunked-planning-parallel.test.cjs",
   "tests/ci-docs-guard-registry.test.cjs",
   "tests/ci-test-scope.test.cjs",
-  "tests/cline-install.test.cjs",
   "tests/code-review-pipeline-regression.test.cjs",
   "tests/codex-config-agents.test.cjs",
   "tests/codex-config-hooks.test.cjs",
@@ -98,7 +97,6 @@ module.exports = {
   "tests/install.test.cjs",
   "tests/installer-migration-antigravity-retire-confighome-artifacts.test.cjs",
   "tests/installer-migration-config-root-marker.test.cjs",
-  "tests/installer-migration-pi-retire-hooks-dir.test.cjs",
   "tests/installer-migration-prune-stale-pristine.test.cjs",
   "tests/installer-migration-rename-msd-core.test.cjs",
   "tests/installer-migrations.test.cjs",
@@ -106,7 +104,6 @@ module.exports = {
   "tests/inventory-nested-families.test.cjs",
   "tests/isolation-sentinel.test.cjs",
   "tests/issue-version-gate.test.cjs",
-  "tests/kimi-upgrades.test.cjs",
   "tests/lint-docs-command-form.test.cjs",
   "tests/lint-retired-runtime-name.test.cjs",
   "tests/lint-workflow-shellcheck-fetch.test.cjs",