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>

docs/reference/host-integration-capability-matrix.md

@@ -462,6 +462,8 @@ Sources consulted:
 Documentation gaps:
 - dispatch.subagentToolkit — docs describe per-subagent configurable permissions (allow/ask/deny) but do not document a single default toolkit level (full vs read-only) for subagents that lack explicit permission overrides.
 
+**EoS migration status (#2093):** Migrated onto the imperative adapter. All `runtime === 'kilo'` / `isKilo` logic branches in `bin/install.js`, `src/install-engine.cts`, `src/runtime-artifact-conversion.cts`, and `src/runtime-artifact-layout.cts` folded into descriptor-driven `runtime.hostBehaviors` (`finishPermissionWriter`, `skipSharedHooksInstall`, and the skills converter registry are now resolved off the descriptor, not a hardcoded Kilo check). Four upgrades land: (1) **native hook-bus plugin** — `.kilo/plugins/gsd-core.js` (byte-identical to `.opencode/plugins/gsd-core.js`, cite: Kilo is an OpenCode fork sharing the same plugin/extension event bus) bridges GSD's hook scripts onto Kilo's plugin event bus; `extensionEvents: "kilo"` reuses `OPENCODE_EXTENSION_EVENTS` verbatim. (2) **active-model routing** — `convertClaudeToKiloFrontmatter` now emits a `model:` field from the resolved `model_overrides`/`model_profile_overrides.kilo.<tier>` value instead of always stripping it (mirrors the OpenCode upgrade; #2256). (3) **MCP companion documented** — `docs/how-to/connect-gsd-mcp-server.md` covers Kilo's `mcp`-keyed config (not `mcpServers`) and its `{type:"local", command, timeout}` entry shape. (4) **named subagent dispatch** — GSD's specialist agents install as `<configDir>/agents/gsd-*.md` with `mode: subagent` frontmatter (the slug Kilo's Task tool dispatches by) and a `permission:` block. `dispatch.subagentToolkit` stays `undocumented` — no authoritative Kilo doc states a default subagent toolkit level — so `degradationFor('dispatch', …)` returns `'degraded'`, not `'full'`, by design (fail-closed negotiation, not a regression).
+
 ---
 
 ## windsurf