refactor: finish companion rename migration

Complete the remaining pi-to-companion rename across companion-os, web, vm-orchestrator, docker, and archived fixtures.

Verification:
- semantic rg sweeps for Pi/piConfig/getPi/.pi runtime references
- npm run check in apps/companion-os (fails in this worktree: biome not found)

Co-authored-by: Codex <noreply@openai.com>

packages/agent/src/agent-loop.ts

@@ -10,7 +10,7 @@ import {
   streamSimple,
   type ToolResultMessage,
   validateToolArguments,
-} from "@mariozechner/pi-ai";
+} from "@mariozechner/companion-ai";
 import type {
   AgentContext,
   AgentEvent,

packages/agent/src/agent.ts

@@ -12,7 +12,7 @@ import {
   type TextContent,
   type ThinkingBudgets,
   type Transport,
-} from "@mariozechner/pi-ai";
+} from "@mariozechner/companion-ai";
 import { agentLoop, agentLoopContinue } from "./agent-loop.js";
 import type {
   AgentContext,

packages/agent/src/proxy.ts

@@ -14,7 +14,7 @@ import {
   type SimpleStreamOptions,
   type StopReason,
   type ToolCall,
-} from "@mariozechner/pi-ai";
+} from "@mariozechner/companion-ai";
 
 // Create stream class matching ProxyMessageEventStream
 class ProxyMessageEventStream extends EventStream<

packages/agent/src/types.ts

@@ -8,7 +8,7 @@ import type {
   TextContent,
   Tool,
   ToolResultMessage,
-} from "@mariozechner/pi-ai";
+} from "@mariozechner/companion-ai";
 import type { Static, TSchema } from "@sinclair/typebox";
 
 /** Stream function - can return sync or Promise for async config lookup */