fix: complete all P3 audit findings — empty modules, docs drift, detekt, worktree

P3-1: Delete 17 empty Gradle modules (core:agents/observability/policies/stages,
      infrastructure:scheduler/security/telemetry, all 7 plugins/*, all 3
      interfaces/*). Zero source files, zero dependents, identical build.gradle
      stubs. Remove from settings.gradle. Keep .adoc spec docs as roadmap refs.
P3-2: Fix docs drift — rename :core:orchestration to :core:kernel in
      core-orchestration-submodule-spec.md, rewrite stale chat-transcript
      modules-and-spec.md as proper doc.
      (CLAUDE.md Router context isolation clarification is local-only,
       file is gitignored.)
P3-3: Reduce detekt maxIssues from 999999 to 120 (actual current count ~107).
      (CLAUDE.md detekt description updated locally; file is gitignored.)
P3-4: Remove stale locked worktree agent-a98d45277ce4b0040 (contained only
      cosmetic test style changes and an unused kotlinx-datetime dep).

settings.gradle

@@ -18,8 +18,6 @@ include ':core:events'
 include ':core:transitions'
 include ':core:context'
 include ':core:inference'
-include ':core:stages'
-include ':core:agents'
 include ':core:artifacts'
 include ':core:artifacts-store'
 include ':core:validation'
@@ -27,8 +25,6 @@ include ':core:approvals'
 include ':core:tools'
 include ':core:router'
 include ':core:sessions'
-include ':core:policies'
-include ':core:observability'
 include ':core:config'
 include ':core:risk'
 
@@ -38,24 +34,9 @@ include ':infrastructure:inference:commons'
 include ':infrastructure:inference:llama_cpp'
 include ':infrastructure:tools'
 include ':infrastructure:tools:filesystem'
-include ':infrastructure:security'
-include ':infrastructure:scheduler'
-include ':infrastructure:telemetry'
 include ':infrastructure:workflow'
 include ':infrastructure:artifacts-cas'
 
-include ':interfaces:api'
-include ':interfaces:cli'
-include ':interfaces:sdk'
-
-include ':plugins:tools'
-include ':plugins:validators'
-include ':plugins:compressors'
-include ':plugins:providers'
-include ':plugins:transitions'
-include ':plugins:stages'
-include ':plugins:policies'
-
 include ':testing:replay'
 include ':testing:contracts'
 include ':testing:kernel'