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/lint-docs-guard-registration.exempt-baseline.cjs

@@ -40,10 +40,8 @@ const DOCS_GUARD_EXEMPT_BASELINE = [
   'capability-validator-task-content-resolver.test.cjs',
   'ci-docs-guard-registry.test.cjs',
   'ci-test-scope.test.cjs',
-  'cline-install.test.cjs',
   'code-review-depth.test.cjs',
   'code-review-pipeline-regression.test.cjs',
-  'codebuddy-upgrades.test.cjs',
   'commands.test.cjs',
   'commit-docs-bypass.test.cjs',
   'compact-content-partition-guard.test.cjs',
@@ -58,13 +56,10 @@ const DOCS_GUARD_EXEMPT_BASELINE = [
   'gen-context-index.test.cjs',
   'gen-registry.test.cjs',
   'msd-agent-isolation-guard.test.cjs',
-  'hermes-dispatch-upgrade.test.cjs',
   'install-minimal-hooks.test.cjs',
   'install-runtime-artifacts.test.cjs',
   'installer-migration-config-root-marker.test.cjs',
-  'installer-migration-pi-extension-ext.test.cjs',
   'installer-migrations.test.cjs',
-  'kimi-upgrades.test.cjs',
   'lint-allow-test-rule-refs.test.cjs',
   'lint-docs-command-form.test.cjs',
   'lint-docs-required.test.cjs',
@@ -84,7 +79,6 @@ const DOCS_GUARD_EXEMPT_BASELINE = [
   'reviewer-manifest-body.test.cjs',
   'reviewer-step-dispatch.test.cjs',
   'run-tests-harness.test.cjs',
-  'runtime-name-policy.test.cjs',
   'security-prompt-injection.security.test.cjs',
   'shipped-reference-cites.test.cjs',
   'state.test.cjs',
@@ -134,10 +128,8 @@ const DOCS_GUARD_EXEMPT_DOCS_PATHS = {
     'docs/adr/4641-windows-selector-consolidation.md', 'docs/how-to/configure-model-profiles.md',
     'docs/installer-migrations.md', 'docs/ja-JP', 'docs/ja-JP/USAGE.md', 'docs/usage.md', 'docs/x.md',
   ],
-  'cline-install.test.cjs': ['docs/guide.md'],
   'code-review-depth.test.cjs': ['docs/src/auth/x.ts'],
   'code-review-pipeline-regression.test.cjs': ['docs/DEVELOPMENT.md'],
-  'codebuddy-upgrades.test.cjs': ['docs/cli/sub-agents'],
   'commands.test.cjs': ['docs/x.md'],
   'commit-docs-bypass.test.cjs': [
     'docs/40-design.md', 'docs/CONFIGURATION.md', 'docs/readme.md', 'docs/tracked-var-mentioning',
@@ -166,13 +158,10 @@ const DOCS_GUARD_EXEMPT_DOCS_PATHS = {
   'gen-context-index.test.cjs': ['docs/CONTEXT-INDEX.json', 'docs/INVENTORY-MANIFEST.json'],
   'gen-registry.test.cjs': ['docs/registries', 'docs/registries/reviewers.json'],
   'msd-agent-isolation-guard.test.cjs': ['docs/adr/1239-...md', 'docs/adr/1239-msd-embeddable-orchestration-engine.md'],
-  'hermes-dispatch-upgrade.test.cjs': ['docs/guides/delegation-patterns.md'],
   'install-minimal-hooks.test.cjs': ['docs/en/hooks', 'docs/en/users/features/hooks'],
-  'install-runtime-artifacts.test.cjs': ['docs/CONFIGURATION.md', 'docs/adr/58-...md', 'docs/adr/58-runtime-install-policy-module.md', 'docs/cli/slash-commands'],
+  'install-runtime-artifacts.test.cjs': ['docs/CONFIGURATION.md', 'docs/adr/58-...md', 'docs/adr/58-runtime-install-policy-module.md'],
   'installer-migration-config-root-marker.test.cjs': ['docs/installer-migrations.md'],
-  'installer-migration-pi-extension-ext.test.cjs': ['docs/installer-migrations.md'],
   'installer-migrations.test.cjs': ['docs/installer-migrations.md'],
-  'kimi-upgrades.test.cjs': ['docs/reference/host-integration-capability-matrix.md'],
   'lint-allow-test-rule-refs.test.cjs': ['docs/readme.md'],
   'lint-docs-command-form.test.cjs': ['docs/adr', 'docs/adr/999-example.md', 'docs/how-to/example.md'],
   'lint-docs-required.test.cjs': [
@@ -230,7 +219,6 @@ const DOCS_GUARD_EXEMPT_DOCS_PATHS = {
   // review). Neither is a real filesystem read — the file never reads any docs/ file.
   'reviewer-step-dispatch.test.cjs': ['docs/adr/456-test-rigor-architecture.md', 'docs/spec.md'],
   'run-tests-harness.test.cjs': ['docs/TESTING-SUITES.md'],
-  'runtime-name-policy.test.cjs': ['docs/customize/skills'],
   'security-prompt-injection.security.test.cjs': ['docs/notes.md'],
   'shipped-reference-cites.test.cjs': [],
   // #4186: the record-session usage-contract test cites the documented