[Bug] Performance: In-place BoundedMap Update Causes High Allocation

[akramcodez]

Description

useAppState.tsx:265-275 allocates a new BoundedMap on every miss by making a full copy of existing entries, which is inefficient and triggers unnecessary garbage collection.

Environment

• OS: Any
• Node version: Node 22+
• Nanocoder version: 1.29.0
• Provider: Any
• Model: Any

Steps to Reproduce

1. Run Nanocoder in interactive mode.
2. Perform operations that frequently miss the BoundedMap cache.
3. Profile memory allocations.

Expected Behavior

The map should update in-place, perhaps by tracking the oldest entry via an insertion counter.

Actual Behavior

A new BoundedMap is allocated on every miss.

Logs/Screenshots

N/A

Additional Context

• I have searched existing issues to ensure this is not a duplicate
• I can reproduce this issue consistently
• This issue occurs with the latest version of nanocoder and feat