revert: back out the ENT-679 Intelligence threads rollout (CopilotKit#5151, CopilotKit#5196, CopilotKit#5205, CopilotKit#5211) (CopilotKit#5217)

## Summary

Reverts the four remaining Intelligence/threads merges, completing the
back-out started by CopilotKit#5215 (langgraph-fastapi) and CopilotKit#5216 (agent-spec):

- Revert CopilotKit#5211 — mcp-apps
- Revert CopilotKit#5205 — a2a-middleware
- Revert CopilotKit#5196 — pydantic-ai
- Revert CopilotKit#5151 — north-star foundation + batch 1 (incl. crewai-flows
CopilotKit#5189 and llamaindex CopilotKit#5199, which merged into it)

## End-state verification

- `git diff be20a38 HEAD -- examples/integrations` is **empty** —
every integration example is byte-identical to pre-CopilotKit#5151 main
(`be20a389cf`, the merge's first parent).
- `scripts/__tests__/integration-intelligence-migration.test.ts`
(introduced by the rollout) is deleted.
- Total scope vs main: examples/integrations + that test file. Nothing
else touched.

## Heads-up: collateral on two follow-up commits

@jpr5 — your agent-key standardization commits (4bf50c7, 2103d0c)
were written against the post-CopilotKit#5151 trees (they update `agentId` refs on
ThreadsDrawer/CopilotChatConfigurationProvider etc.), so this revert
necessarily takes those files back to their pre-CopilotKit#5151 content, undoing
the rename. Keeping the rename only where it auto-applied would have
left broken half-states (e.g. adk route registering `default` while the
restored layout pins `agent="my_agent"`). If you still want the rename
on the pre-threads files, it needs a fresh pass on top of this.

Also note: CopilotKit#5151 carried the starter-smoke heals (v2 label keys, 1.59.1
bumps, `useSingleEndpoint`, parity sync). Reverting it returns main's
starter smoke to its pre-CopilotKit#5151 state (9 starters red).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Author: BenTaylorDev

examples/integrations/_intelligence/.env.intelligence

@@ -33,10 +33,6 @@
       "src/components/generative-ui/meeting-time-picker.tsx",
       "src/components/headless-chat.tsx",
       "src/components/tool-rendering.tsx",
-      "src/components/threads-drawer/index.tsx",
-      "src/components/threads-drawer/locked-state.tsx",
-      "src/components/threads-drawer/threads-drawer.module.css",
-      "src/components/threads-drawer/threads-drawer.tsx",
       "src/components/ui/badge.tsx",
       "src/components/ui/button.tsx",
       "src/components/ui/card.tsx",
@@ -130,10 +126,7 @@
         "docker-compose.test.yml",
         "entrypoint.sh",
         "serve.py",
-        "scripts/**",
-        "src/components/threads-drawer/**",
-        "src/app/page.tsx",
-        "next.config.ts"
+        "scripts/**"
       ],
       "packageJsonOverrides": {
         "scripts.dev:agent": "./scripts/run-agent.sh || scripts\\\\run-agent.bat",
@@ -151,10 +144,7 @@
         "src/app/api/copilotkit/**",
         "docker/Dockerfile.agent",
         "docker-compose.test.yml",
-        "scripts/**",
-        "src/components/threads-drawer/**",
-        "src/app/page.tsx",
-        "next.config.ts"
+        "scripts/**"
       ],
       "packageJsonOverrides": {
         "scripts.dev:agent": "cd agent && uv run main.py",
@@ -174,10 +164,7 @@
         "docker/Dockerfile.agent",
         "docker-compose.test.yml",
         "serve.py",
-        "scripts/**",
-        "src/components/threads-drawer/**",
-        "src/app/page.tsx",
-        "next.config.ts"
+        "scripts/**"
       ],
       "packageJsonOverrides": {
         "scripts.dev:agent": "./scripts/run-agent.sh || scripts\\\\run-agent.bat",

examples/integrations/_intelligence/README.md

@@ -39,13 +39,3 @@ RESEARCH_PORT=9001
 
 # Analysis Agent
 ANALYSIS_PORT=9002
-
-
-# ========================================
-# CopilotKit Intelligence Threads (Optional)
-# ========================================
-
-# COPILOTKIT_LICENSE_TOKEN=
-# INTELLIGENCE_API_KEY=
-# INTELLIGENCE_API_URL=http://localhost:4201
-# INTELLIGENCE_GATEWAY_WS_URL=ws://localhost:4401