fix: resolve three open bugs (#2836, #2858, #2873)

- fix(context-limit): check modelContextLimitsCache for all Anthropic
  models, not just GA-model set; user config/cache wins over 200K default
  (fixes #2836)

- fix(agent-key-remapper): preserve config key aliases alongside display
  names so `opencode run --agent sisyphus` resolves correctly
  (fixes #2858)

- fix(tool-config): respect host permission.skill=deny by disabling
  skill/skill_mcp tools when host denies them (fixes #2873)

- test: update context-limit and agent-key-remapper tests to match new
  behavior

src/plugin-handlers/agent-key-remapper.ts

@@ -9,6 +9,7 @@ export function remapAgentKeysToDisplayNames(
     const displayName = AGENT_DISPLAY_NAMES[key]
     if (displayName && displayName !== key) {
       result[displayName] = value
+      result[key] = value
     } else {
       result[key] = value
     }