enable image attachments to the chatHEADmain

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+# Changelog — 2026-03-29 — 01
+
+## Image Attachment Backend (Part 1)
+
+### New Files
+
+- **`src/image-attachments.ts`** — Module-level storage for pending image attachments (`ImageAttachment` interface, `setCurrentAttachments`, `getCurrentAttachments`, `clearCurrentAttachments`, `hasCurrentAttachments`).
+- **`src/context/tools/save-image.json`** — Tool context JSON for the `save_image` tool (id, label, description, friendlyName, requiresApproval, Ollama function definition with `file_path` parameter).
+
+### Modified Files
+
+- **`src/tools.ts`**
+  - Added imports for `save-image.json` and `image-attachments` module.
+  - Added `mimeToExtension()` helper mapping MIME types to file extensions.
+  - Added `executeSaveImage()` — saves attached images to vault, handles single/multi naming, creates parent folders, clears attachments after save.
+  - Added `save_image` entry to `TOOL_REGISTRY` with `approvalMessage`, `summarize`, `summarizeResult`, and `execute` callbacks.
+
+- **`src/ollama-client.ts`**
+  - Added import for `hasCurrentAttachments` from `image-attachments`.
+  - Added `"save_image"` case to `preValidateTool` switch.
+  - Added `preValidateSaveImage()` — validates `file_path` is provided and attachments exist before prompting user approval.