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/cli-exit.cjs

@@ -407,7 +407,7 @@ function runMain(main) {
  *   like `payload`. This exists because `hooks/msd-write-guard.js`'s
  *   emitBlock does NOT write the same bytes to both streams today — it
  *   writes the full JSON `output` to stdout but only the plain-text
- *   `output.reason` STRING to stderr, because Kimi's native hook bus reads
+ *   `output.reason` STRING to stderr, because a native hook bus may read
  *   stderr verbatim back to the model on exit 2. Migrating that call site
  *   onto terminateNow requires a way to say "fd 2 gets this different,
  *   plain-text value" — `stderrPayload` is that seam. Ignored entirely for

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",

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

@@ -6,7 +6,6 @@ module.exports = {
   "tests/adr-index-gate.test.cjs",
   "tests/adr857-core-without-capabilities.test.cjs",
   "tests/agent-install-check.test.cjs",
-  "tests/agent-install-validation.test.cjs",
   "tests/agent-skills.test.cjs",
   "tests/antigravity-upgrades.test.cjs",
   "tests/api-coverage-gate-e2e.test.cjs",
@@ -14,7 +13,6 @@ module.exports = {
   "tests/assumption-delta-checkpoint-e2e.test.cjs",
   "tests/assumption-delta.test.cjs",
   "tests/audit-command-cutover.test.cjs",
-  "tests/augment-upgrades.test.cjs",
   "tests/broken-windows.test.cjs",
   "tests/capability-cli.test.cjs",
   "tests/capability-command-dispatch.test.cjs",
@@ -40,7 +38,6 @@ module.exports = {
   "tests/ci-test-scope.test.cjs",
   "tests/cjs-command-router-adapter.test.cjs",
   "tests/claude-md.test.cjs",
-  "tests/cline-install.test.cjs",
   "tests/close-phase-todos-padded-resolves.test.cjs",
   "tests/code-review-fix-pipeline-regression.test.cjs",
   "tests/code-review-pipeline-regression.test.cjs",
@@ -64,8 +61,6 @@ module.exports = {
   "tests/config-schema.property.test.cjs",
   "tests/config.test.cjs",
   "tests/configured-entrypoint-validation.test.cjs",
-  "tests/copilot-install.test.cjs",
-  "tests/copilot-upgrades.test.cjs",
   "tests/core-utils.test.cjs",
   "tests/cursor-hook-workspace-roots.test.cjs",
   "tests/cursor-hooks.test.cjs",
@@ -108,7 +103,6 @@ module.exports = {
   "tests/health-diagnostic.test.cjs",
   "tests/helpers-cleanup.test.cjs",
   "tests/helpers-process-isolation.test.cjs",
-  "tests/hermes-skills-migration.test.cjs",
   "tests/hooks-commonjs-marker.test.cjs",
   "tests/hooks-crash-policy.test.cjs",
   "tests/hooks-opt-in.test.cjs",
@@ -124,7 +118,6 @@ 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",
@@ -132,10 +125,6 @@ module.exports = {
   "tests/inventory-nested-families.test.cjs",
   "tests/io.test.cjs",
   "tests/isolation-sentinel.test.cjs",
-  "tests/kilo-upgrades.test.cjs",
-  "tests/kimi-agent-converter.test.cjs",
-  "tests/kimi-upgrades.test.cjs",
-  "tests/kimi-variant-disambiguation.test.cjs",
   "tests/lint-workflow-shellcheck-fetch.test.cjs",
   "tests/live-config-guard.test.cjs",
   "tests/lockfile-cve-audit.test.cjs",
@@ -185,7 +174,6 @@ module.exports = {
   "tests/phase-locator.test.cjs",
   "tests/phase.test.cjs",
   "tests/phase6-capstone-conformance.test.cjs",
-  "tests/pi-config-dir-env-override.test.cjs",
   "tests/plan-count-single-owner.test.cjs",
   "tests/plan-phase-stall-detection.test.cjs",
   "tests/plan-pre-hook-e2e.test.cjs",
@@ -216,7 +204,6 @@ module.exports = {
   "tests/quick-review-scope-tip-bound.test.cjs",
   "tests/read-guard.test.cjs",
   "tests/reapply-verify-hunks.test.cjs",
-  "tests/repo-layout.test.cjs",
   "tests/representative-corpus.test.cjs",
   "tests/require-fs-op-fallback.rule.test.cjs",
   "tests/require-full-tmpdir-triad.rule.test.cjs",
@@ -269,7 +256,6 @@ module.exports = {
   "tests/verify-archive-dirs-live-path.test.cjs",
   "tests/verify-command-grounding.test.cjs",
   "tests/verify.test.cjs",
-  "tests/windsurf-hooks-bridge.test.cjs",
   "tests/workflow-guard.test.cjs",
   "tests/workflow-shell-pinning.test.cjs",
   "tests/workstream-inventory.test.cjs",