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.

docs/features/multi-runtime-support.md

@@ -7,7 +7,7 @@ group: Infrastructure Features
 **Purpose:** Run MSD across multiple AI coding agent runtimes.
 
 **Requirements:**
-- REQ-RUNTIME-01: System MUST support Claude Code, OpenCode, Kilo, Codex, Copilot, Antigravity, Trae, Cline, Augment Code, CodeBuddy, Qwen Code
+- REQ-RUNTIME-01: System MUST support Claude Code, OpenCode, Codex, Antigravity, Cursor
 - REQ-RUNTIME-02: Installer MUST transform content per runtime (tool names, paths, frontmatter)
 - REQ-RUNTIME-03: Installer MUST support interactive and non-interactive (`--claude --global`) modes
 - REQ-RUNTIME-04: Installer MUST support both global and local installation
@@ -18,35 +18,28 @@ group: Infrastructure Features
 
 **Runtime Transformations:**
 
-| Aspect | Claude Code | OpenCode | Kilo | Codex | Copilot | Antigravity | Cursor | Trae | Cline | Augment | CodeBuddy | Qwen Code |
-|--------|------------|----------|-------|-------|---------|-------------|--------|------|-------|---------|-----------|-----------|
-| Commands | Slash commands | Slash commands | Slash commands | Skills (TOML) | Slash commands | Skills | Skills + Slash commands | Skills | Rules | Skills + Slash commands | Slash commands | Skills |
-| Agent format | Claude native | `mode: subagent` | `mode: subagent` | Skills | Tool mapping | Skills | Skills | Skills | Rules | Skills | Skills | Skills |
-| Skills emission | N/A | On-demand SKILL.md (1.4.0) | On-demand SKILL.md (1.4.0) | `/skills` picker (1.4.0) | N/A | N/A | SKILL.md | N/A | On-demand SKILL.md (1.4.0) | N/A | N/A | N/A |
-| Hook events | `SessionStart`, `PreToolUse`, `PostToolUse`, `SubagentStop`, `Stop`, `PreCompact`, `FileChanged` | N/A | N/A | `SessionStart`, `SubagentStart`, `Stop`, `PostToolUse` | `sessionStart` | N/A | `sessionStart`, `postToolUse` | N/A | `PreToolUse` | N/A | N/A | `SessionStart`, `PreToolUse`, `PostToolUse`, `SubagentStop`, `Stop`, `PreCompact` |
-| Config | `settings.json` | `opencode.json(c)` | `kilo.json(c)` | TOML | Instructions | Config | Config | Config | `.clinerules` | Config | Config | Config |
+| Aspect | Claude Code | OpenCode | Codex | Antigravity | Cursor |
+|--------|------------|----------|-------|-------------|--------|
+| Commands | Slash commands | Slash commands | Skills (TOML) | Skills | Skills + Slash commands |
+| Agent format | Claude native | `mode: subagent` | Skills | Skills | Skills |
+| Skills emission | N/A | On-demand SKILL.md (1.4.0) | `/skills` picker (1.4.0) | N/A | SKILL.md |
+| Hook events | `SessionStart`, `PreToolUse`, `PostToolUse`, `SubagentStop`, `Stop`, `PreCompact`, `FileChanged` | N/A | `SessionStart`, `SubagentStart`, `Stop`, `PostToolUse` | N/A | `sessionStart`, `postToolUse` |
+| Config | `settings.json` | `opencode.json(c)` | TOML | Config | Config |
 
 **Cursor artifact surfaces:** `msd install --cursor` writes two artifact kinds:
 - `~/.cursor/skills/msd-<name>/SKILL.md` — rich skills with YAML frontmatter, Cursor tool-name mapping, and adapter context header (existing surface)
 - `~/.cursor/commands/msd-<name>.md` — plain markdown slash commands (no frontmatter) invocable via `/` in the Agent input (Cursor 1.6+)
 
-**Native skills emission (1.4.0):** Three runtimes now emit MSD as on-demand native skills (`skills/<name>/SKILL.md`) at install time, in addition to their existing command and agent surfaces. Skills respect the active install profile and are removed on uninstall.
-- **Cline** (global installs, Cline >= v3.48.0) — emits skills alongside the existing `.clinerules/` directory
-- **Kilo** — emits skills alongside `command/` and `agents/`
+**Native skills emission (1.4.0):** One runtime now emits MSD as on-demand native skills (`skills/<name>/SKILL.md`) at install time, in addition to their existing command and agent surfaces. Skills respect the active install profile and are removed on uninstall.
 - **OpenCode** — emits skills alongside its existing surfaces
 
 **New slash-command surfaces (1.4.0):**
-- **CodeBuddy** — `/msd-*` slash commands written to `~/.codebuddy/commands/`
-- **Augment** — `commands/msd-<name>.md` written to `~/.augment/commands/`
 - **Cursor** (Cursor >= 1.6) — `.cursor/commands/msd-<name>.md` so MSD appears in the `/` command menu
 
 **Cross-runtime lifecycle hooks (1.4.0):** Each supported runtime registers lifecycle hook events for per-turn context-headroom tracking and workflow state management. Notable registrations:
 - **Claude Code:** `SubagentStop`, `Stop`, `PreCompact` (context-headroom warnings), `FileChanged` (hot-reloads `.planning/config.json` mid-session)
-- **Qwen Code:** `SubagentStop`, `Stop`, `PreCompact`
 - **Codex:** `SubagentStart`, `Stop`, `PostToolUse` (new in 1.4.0); on Windows the `SessionStart` hook entry gains a `commandWindows` field so the `.cmd` shim is used for native execution
-- **Cline:** `PreToolUse`
 - **Cursor:** `sessionStart` (injects workflow state), `postToolUse` (nudges `.planning` updates)
-- **Copilot:** `sessionStart`
 
 **Runtime-specific enrichments (1.4.0):**
 - Codex emits `service_tier: flex` for light-tier agents; MSD skills appear in the Codex `/skills` picker via `SKILL.md` (no `agents/openai.yaml` sidecar is emitted — doing so caused duplicate autocomplete entries, #1326)