feat: add session-tools-store for tracking tool restrictions per session

In-memory Map-based store that records tool restriction objects (e.g.,
question: false) by sessionID when prompts are sent. This enables
retrieving the original session's tool parameters when background tasks
complete and need to notify the parent session.

src/shared/session-tools-store.test.ts

@@ -0,0 +1,72 @@
+import { describe, test, expect, beforeEach } from "bun:test"
+import { setSessionTools, getSessionTools, clearSessionTools } from "./session-tools-store"
+
+describe("session-tools-store", () => {
+  beforeEach(() => {
+    clearSessionTools()
+  })
+
+  test("returns undefined for unknown session", () => {
+    //#given
+    const sessionID = "ses_unknown"
+
+    //#when
+    const result = getSessionTools(sessionID)
+
+    //#then
+    expect(result).toBeUndefined()
+  })
+
+  test("stores and retrieves tools for a session", () => {
+    //#given
+    const sessionID = "ses_abc123"
+    const tools = { question: false, task: true, call_omo_agent: true }
+
+    //#when
+    setSessionTools(sessionID, tools)
+    const result = getSessionTools(sessionID)
+
+    //#then
+    expect(result).toEqual({ question: false, task: true, call_omo_agent: true })
+  })
+
+  test("overwrites existing tools for same session", () => {
+    //#given
+    const sessionID = "ses_abc123"
+    setSessionTools(sessionID, { question: false })
+
+    //#when
+    setSessionTools(sessionID, { question: true, task: false })
+    const result = getSessionTools(sessionID)
+
+    //#then
+    expect(result).toEqual({ question: true, task: false })
+  })
+
+  test("clearSessionTools removes all entries", () => {
+    //#given
+    setSessionTools("ses_1", { question: false })
+    setSessionTools("ses_2", { task: true })
+
+    //#when
+    clearSessionTools()
+
+    //#then
+    expect(getSessionTools("ses_1")).toBeUndefined()
+    expect(getSessionTools("ses_2")).toBeUndefined()
+  })
+
+  test("returns a copy, not a reference", () => {
+    //#given
+    const sessionID = "ses_abc123"
+    const tools = { question: false }
+    setSessionTools(sessionID, tools)
+
+    //#when
+    const result = getSessionTools(sessionID)!
+    result.question = true
+
+    //#then
+    expect(getSessionTools(sessionID)).toEqual({ question: false })
+  })
+})

src/shared/session-tools-store.ts

@@ -0,0 +1,14 @@
+const store = new Map<string, Record<string, boolean>>()
+
+export function setSessionTools(sessionID: string, tools: Record<string, boolean>): void {
+  store.set(sessionID, { ...tools })
+}
+
+export function getSessionTools(sessionID: string): Record<string, boolean> | undefined {
+  const tools = store.get(sessionID)
+  return tools ? { ...tools } : undefined
+}
+
+export function clearSessionTools(): void {
+  store.clear()
+}