feat: Claude Code Monitor — lanes, pipelines and a merged workspace

Internal SmartGift build of a Claude Code monitoring dashboard.

Lanes: a durable unit of parallel agent work, one per working directory,
tracked across session restarts. Managed lanes are git worktrees the
dashboard provisions and can reset or remove behind a three-check destroy
guard and a counted preflight; adopted lanes are directories you already
own and are never destroyable.

Pipelines: a lane moves through pipeline stages. A stage the agent declares
with evidence renders green; a stage inferred from the tool-event stream
renders dashed amber and never counts as done. Detection is forward-only
within a 30-minute window, and never writes the declared stage.

Workspace: one page at /run with a lane grid, the selected lane's pipeline,
and a full Claude console behind a disclosure.

desktop/assets/tray-icon.svg

@@ -0,0 +1,19 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 22" width="22" height="22">
+  <!--
+    macOS menu-bar (tray) glyph. Three ascending bars — a "monitor activity"
+    silhouette that reads cleanly at 18-22 px. Solid black on transparent so
+    macOS template tinting (filename ends in "Template.png" + nativeImage
+    setTemplateImage(true)) handles light and dark menu bars automatically.
+    No thin strokes — they collapse to a blob at small sizes.
+
+    NOTE: this SVG is the design intent only. The PNGs in this folder are
+    generated pixel-by-pixel by `scripts/build-icons.sh` (using Python's
+    stdlib `zlib` + a tiny RGBA encoder) — `qlmanage` flattens SVG against
+    an opaque white background and would yield an all-white tray icon.
+  -->
+  <g fill="black">
+    <rect x="2"  y="14" width="4" height="7"/>
+    <rect x="9"  y="11" width="4" height="10"/>
+    <rect x="16" y="5"  width="4" height="16"/>
+  </g>
+</svg>