feat(#2093): migrate Kilo onto EoS imperative adapter + hook-bus/model/MCP/dispatch upgrades (ADR-1239)

Fold remaining isKilo logic branches into descriptor-driven reads:
finishPermissionWriter (uninstall cleanup), skipSharedHooksInstall (hooks
copy), and a skills converter-name registry (the artifactLayout.converter
field is now load-bearing, not decorative). frontmatterDialect stays the
documented dispatch key for frontmatter (no descriptor field for it). Dead
isKilo destructure bindings removed. Byte-identical golden parity for all 16
runtimes (opencode, which shares kilo's combined-family path, verified clean).

UPGRADE 1 (hook bus): install .kilo/plugins/gsd-core.js native plugin +
extensionEvents:"kilo" + EXTENSION_EVENT_SURFACES.kilo (OpenCode-fork bus).
UPGRADE 2 (active model): populate runtimeTierDefaults.kilo + thread
modelOverride through convertClaudeToKiloFrontmatter — model no longer stripped
from agents. UPGRADE 3 (MCP): document the gsd-core MCP companion under kilo's
mcp config key. UPGRADE 4 (named dispatch): agents/*.md mode:subagent roster is
the Task-tool dispatch surface (tested); subagentToolkit stays 'undocumented'
per AC so dispatch degrades to 'degraded' by design.

Model-catalog single-source edit ripples the shared model-catalog.json hash
into all 16 golden fixtures (expected). Inline defect fixes (no-defer): stale-
bake-guard resolveAgentDir 'agent'->'agents' (was a silent no-op for opencode/
codex), hardcoded 'Removed OpenCode plugin' uninstall log -> generic, and the
connect-gsd-mcp-server.md OpenCode mcpServers->mcp doc error.

Tests: kilo-imperative-reference (adapter/axes/fail-closed/degradation/
hostBehaviors + widened isKilo source-grep across 4 modules) + kilo-upgrades
(plugin parity+load, model-override converter, agents dispatch surface, MCP
doc). Matrix + how-to + config docs updated; changeset added.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/fixtures/golden-install-parity/opencode.json

@@ -113,7 +113,7 @@
   "gsd-core/bin/gsd_run": "62d9b647ede212e6",
   "gsd-core/bin/shared/config-defaults.manifest.json": "517e6a7c1e9f4f16",
   "gsd-core/bin/shared/config-schema.manifest.json": "6bba2b9c9fa47cb8",
-  "gsd-core/bin/shared/model-catalog.json": "eee64a2cf3b94c00",
+  "gsd-core/bin/shared/model-catalog.json": "d0b59409a46a456a",
   "gsd-core/bin/shared/runtime-aliases.manifest.json": "2df2c5ac1957911a",
   "gsd-core/bin/verify-reapply-patches.cjs": "caec5dbce11e3904",
   "gsd-core/contexts/dev.md": "dcb0de9dce33cf41",
@@ -360,7 +360,7 @@
   "gsd-core/workflows/scan.md": "ad8ebcad4626d4a8",
   "gsd-core/workflows/secure-phase.md": "e9a488cec3b4efdc",
   "gsd-core/workflows/session-report.md": "2e5b1205324ddefa",
-  "gsd-core/workflows/settings-advanced.md": "afa9c38b68500b29",
+  "gsd-core/workflows/settings-advanced.md": "92524bd2a53b43f5",
   "gsd-core/workflows/settings-integrations.md": "d1711a95f44fdbde",
   "gsd-core/workflows/settings.md": "2e42ee34c791378a",
   "gsd-core/workflows/ship.md": "924c79e3cfd1e42b",