CMMS fork: hand the board photos to the AI bridge

The board photos live in pcb-retrace's IndexedDB, not as CMMS
attachments, so the assistant had no way to see them and burned all its
tool-call rounds looking. cmms-bridge.js now downscales each project
photo (long edge ~1400px, JPEG q0.8 - a phone photo lands under ~300KB)
and sends them alongside the buffer in the cmms-ai-editor-buffer reply
as `images: [{id,name,mime,data_base64}]` (max 6). The CMMS
read_board_image tool surfaces one at a time.

docs/cmms-bridge.js

@@ -160,6 +160,47 @@
 		return JSON.stringify(view);
 	}
 
+	// The board photos live in pcb-retrace's IndexedDB (imported by the user or
+	// unpacked from the .pcbretrace.zip), NOT as CMMS attachments, so the
+	// assistant can't reach them with read_attachment_image. Downscale + JPEG
+	// each and hand them along with the buffer so a `read_board_image` tool can
+	// surface them. Long edge ~1400px, quality 0.8 - a phone photo lands well
+	// under 300KB.
+	async function encodeImage(blob, maxEdge) {
+		const bmp = await createImageBitmap(blob);
+		const s = Math.min(1, maxEdge / Math.max(bmp.width, bmp.height));
+		const w = Math.max(1, Math.round(bmp.width * s));
+		const h = Math.max(1, Math.round(bmp.height * s));
+		const c = document.createElement('canvas');
+		c.width = w; c.height = h;
+		c.getContext('2d').drawImage(bmp, 0, 0, w, h);
+		bmp.close();
+		const out = await new Promise(res => c.toBlob(res, 'image/jpeg', 0.8));
+		const b64 = await new Promise((res, rej) => {
+			const r = new FileReader();
+			r.onload = () => res(String(r.result).split(',', 2)[1] || '');
+			r.onerror = rej;
+			r.readAsDataURL(out);
+		});
+		return { w, h, b64 };
+	}
+
+	async function buildProjectImages() {
+		if (!currentBomId || !bomImages.length) return [];
+		const out = [];
+		for (const img of bomImages.slice(0, 6)) {
+			try {
+				const enc = await encodeImage(img.blob, 1400);
+				if (enc.b64.length > 3 * 1024 * 1024) { trace('image too large after encode, skipping', img.id); continue; }
+				out.push({ id: img.id, name: img.name || (img.id + '.jpg'), mime: 'image/jpeg', data_base64: enc.b64 });
+			} catch (e) {
+				trace('image encode failed', img.id, e && e.message);
+			}
+		}
+		trace('buildProjectImages:', out.length, 'of', bomImages.length, 'photos encoded');
+		return out;
+	}
+
 	async function applyProjectPatch(patchJson) {
 		const patch = JSON.parse(patchJson);
 		if (!currentBomId) { status('Select or create a board first', true); return; }
@@ -227,8 +268,10 @@
 		if (d.type === 'cmms-ai-editor-get-buffer') {
 			trace('get-buffer received');
 			let buffer = null;
+			let images = [];
 			try { buffer = await buildProjectView(); } catch (e) { trace('buildProjectView threw:', e && e.message); }
-			replyToChat(evt.source, { type: 'cmms-ai-editor-buffer', buffer: buffer });
+			try { images = await buildProjectImages(); } catch (e) { trace('buildProjectImages threw:', e && e.message); }
+			replyToChat(evt.source, { type: 'cmms-ai-editor-buffer', buffer: buffer, images: images });
 		} else if (d.type === 'cmms-ai-editor-apply' && d.editor === 'pcb' && typeof d.new_source === 'string') {
 			trace('apply received');
 			try {