fix(hooks): propagate ephemeral sessionId through embedded tool contexts (#32273)

* fix(plugins): expose ephemeral sessionId in tool contexts for per-conversation isolation

The plugin tool context (`OpenClawPluginToolContext`) and tool hook
context (`PluginHookToolContext`) only provided `sessionKey`, which
is a durable channel identifier that survives /new and /reset.
Plugins like mem0 that need per-conversation isolation (e.g. mapping
Mem0 `run_id`) had no way to distinguish between conversations,
causing session-scoped memories to persist unbounded across resets.

Add `sessionId` (ephemeral UUID regenerated on /new and /reset) to:
- `OpenClawPluginToolContext` (factory context for plugin tools)
- `PluginHookToolContext` (before_tool_call / after_tool_call hooks)
- Internal `HookContext` for tool call wrappers

Thread the value from the run attempt through createOpenClawCodingTools
→ createOpenClawTools → resolvePluginTools and through the tool hook
wrapper.

Closes #31253

Made-with: Cursor

* fix(agents): propagate embedded sessionId through tool hook context

* test(hooks): cover sessionId in embedded tool hook contexts

* docs(changelog): add sessionId hook context follow-up note

* test(hooks): avoid toolCallId collision in after_tool_call e2e

---------

Co-authored-by: SidQin-cyber <sidqin0410@gmail.com>

src/agents/openclaw-tools.ts

@@ -70,6 +70,8 @@ export function createOpenClawTools(options?: {
   requesterSenderId?: string | null;
   /** Whether the requesting sender is an owner. */
   senderIsOwner?: boolean;
+  /** Ephemeral session UUID — regenerated on /new and /reset. */
+  sessionId?: string;
 }): AnyAgentTool[] {
   const workspaceDir = resolveWorkspaceRoot(options?.workspaceDir);
   const imageTool = options?.agentDir?.trim()
@@ -199,6 +201,7 @@ export function createOpenClawTools(options?: {
         config: options?.config,
       }),
       sessionKey: options?.agentSessionKey,
+      sessionId: options?.sessionId,
       messageChannel: options?.agentChannel,
       agentAccountId: options?.agentAccountId,
       requesterSenderId: options?.requesterSenderId ?? undefined,