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/pi-tools.ts

@@ -188,6 +188,8 @@ export function createOpenClawCodingTools(options?: {
   messageThreadId?: string | number;
   sandbox?: SandboxContext | null;
   sessionKey?: string;
+  /** Ephemeral session UUID — regenerated on /new and /reset. */
+  sessionId?: string;
   agentDir?: string;
   workspaceDir?: string;
   config?: OpenClawConfig;
@@ -493,6 +495,7 @@ export function createOpenClawCodingTools(options?: {
       requesterAgentIdOverride: agentId,
       requesterSenderId: options?.senderId,
       senderIsOwner: options?.senderIsOwner,
+      sessionId: options?.sessionId,
     }),
   ];
   const toolsForMessageProvider = applyMessageProviderToolPolicy(tools, options?.messageProvider);
@@ -533,6 +536,7 @@ export function createOpenClawCodingTools(options?: {
     wrapToolWithBeforeToolCallHook(tool, {
       agentId,
       sessionKey: options?.sessionKey,
+      sessionId: options?.sessionId,
       loopDetection: resolveToolLoopDetectionConfig({ cfg: options?.config, agentId }),
     }),
   );