feat(#1035): phase 5a — author 16 role:runtime capability descriptors (registry-only) (#1039)

Author capabilities/<runtime>/capability.json for all 16 runtimes (role:runtime),
populating the registry's runtimes index ({} -> 16). Each carries the 6 ADR-1016
axes (configHome structured, configFormat, artifactLayout structured, commandStyle,
hooksSurface + hookEvents, sandboxTier, supportTier), extracted from the live
modules (runtime-homes/runtime-slash/runtime-artifact-layout/runtime-config-adapter
+ CODEX_AGENT_SANDBOX). validateRuntimeBody tightened to enforce the closed
vocabularies + structured configHome/artifactLayout (rejects old string configHome;
env required; skillsHome recursively validated).

Registry-only: bin/install.js + src/*.cts untouched, zero behavior change. The 5b-5f
drive steps consume these one axis at a time (ADR-1016 §8).

Codex accuracy review caught + fixed: opencode/kilo register ZERO lifecycle hooks
(install.js skips the whole block) -> hooksSurface:none (configFormat stays
settings-json); kimi probe selects on <root>/skills existence -> probeExists:"skills".
ArtifactKind required-field strictness + ConverterName closing deferred to 5d/5e.
ADR-1016 (Proposed) amended to match (Decisions 1 + 5).

Closes #1035

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

docs/INVENTORY-MANIFEST.json

@@ -1,5 +1,5 @@
 {
-  "generated": "2026-06-10",
+  "generated": "2026-06-11",
   "families": {
     "agents": [
       "gsd-advisor-researcher",

docs/adr/1016-runtime-capability-descriptor.md

@@ -32,8 +32,9 @@ configHome: {
   kind: 'dot-home' | 'dot-home-nested' | 'xdg' | 'generic-agents-root',
   name: string,                 // e.g. 'claude', 'opencode'
   parent?: string,              // for dot-home-nested: e.g. '.gemini' (antigravity), '.codeium' (windsurf)
-  env: string[],                // ordered override env vars, e.g. ['CLAUDE_CONFIG_DIR']
+  env: string[],                // ordered override env vars, e.g. ['CLAUDE_CONFIG_DIR'] (required; may be empty)
   probe?: string[],             // ordered candidate subpaths; first existing wins (antigravity, kimi)
+  probeExists?: string,         // if set, select the first probe candidate where <candidate>/<probeExists> exists (kimi: 'skills')
   skillsHome?: { kind, name, ... }  // override when the skills dir ≠ config dir (kilo only)
 }
 ```
@@ -82,7 +83,7 @@ hookEvents?: 'claude'   // SessionStart/PreToolUse/PostToolUse
            | 'opencode-subset'  // settings-json surface but SessionStart/PostToolUse skipped
 ```
 
-`settings-json` covers claude, gemini, antigravity, augment, qwen, hermes, codebuddy, opencode; the event-name and registration-subset differences ride on `hookEvents` rather than splitting the surface enum. `none` = windsurf, trae, kimi, kilo.
+`settings-json` covers claude, gemini, antigravity, augment, qwen, hermes, codebuddy; the event-name and registration-subset differences ride on `hookEvents` rather than splitting the surface enum. `none` = windsurf, trae, kimi, kilo, opencode — these five runtimes register **zero** managed lifecycle hooks today; `opencode-subset` is reserved ADR vocabulary with no current consumer (opencode and kilo write a `settings.json` for config/permissions, which is the `configFormat` axis, not the hook-registration axis).
 
 ### 6. `sandboxTier` — the agent-sandbox primitive (closed enum)