feat(core): Implement JIT context memory loading and UI sync

[SandyTao520]

TLDR

Refactors memory loading to support the Experimental JIT Context feature. It introduces a unified refresh() method in ContextManager for JIT mode, ensures the UI receives updates via events, and properly includes environment memory (and MCP instructions) in the system context.

Dive Deeper

• ContextManager Refactor: Introduced a refresh() method to unify memory reloading (Global + Environment) and event emission. Removed legacy loadGlobalMemory calls from Config initialization.
• Config Delegation: Config delegates memory state retrieval (file count, paths) to ContextManager when JIT is enabled.
• Event Optimization: Simplified MemoryChanged event to only emit fileCount, as content and paths are pulled from Config on demand or not required for simple UI updates.
• Memory Refresh: Updated /memory refresh command to use ContextManager.refresh() when JIT is enabled.
• System Context: getEnvironmentContext now includes the content of loaded environment memory files. MCP instructions are appended to environment memory in JIT mode.

Reviewer Test Plan

1. Enable JIT: Set experimental.jitContext: true in settings.
2. Startup: Launch the CLI. Verify that the "Using: X GEMINI.md files" indicator appears and shows the correct count.
3. Context: Run /reset and start a chat. Verify (via debug logs or model response) that the system instruction includes content from your GEMINI.md files AND any active MCP server instructions.
4. Refresh: Modify a GEMINI.md file and run /memory refresh. Verify the count updates and the model sees the new content.
5. Legacy: Disable JIT. Verify that memory loading works as before (using the CLI-side loader).

Testing Matrix

	🍏	🪟	🐧
npm run	✅	❓	❓
npx	✅	❓	❓
Docker	❓	❓	❓
Podman	❓	-	-
Seatbelt	❓	-	-

Linked issues / bugs

[gemini-code-assist[bot]]

Summary of Changes

Hello @SandyTao520, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces significant refactoring to the application's memory loading and management system, primarily to enable and support an experimental Just-In-Time (JIT) context feature. The changes centralize memory handling within a new ContextManager class, ensuring that memory is loaded and refreshed consistently. It also establishes a mechanism for the UI to react to memory changes and integrates environment-specific memory directly into the system context provided to the model.

Highlights

• JIT Context Memory Loading: Memory loading has been refactored to support the experimental Just-In-Time (JIT) Context feature, centralizing memory management when JIT is enabled.
• ContextManager Introduction: A new ContextManager class is introduced to handle memory loading and management, including a refresh() method to unify memory reloading and event emission.
• UI Synchronization: The system now emits MemoryChanged events to ensure the UI properly reflects updates to loaded GEMINI.md files, such as during JIT initialization or after a refresh.
• Config Delegation: The Config class now delegates memory state retrieval (user memory, file count, file paths) to the ContextManager when experimentalJitContext is enabled, establishing a single source of truth.
• Enhanced System Context: The getEnvironmentContext function now includes the content of loaded environment memory files, providing more comprehensive system instructions to the model.

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[github-actions[bot]]

Size Change: +1.67 kB (+0.01%)

Total Size: 22 MB

Filename	Size	Change
./bundle/gemini.js	22 MB	+1.67 kB (+0.01%)

ℹ️ View Unchanged

Filename	Size
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB
./bundle/sandbox-macos-permissive-open.sb	890 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB

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