feat: ship manifest.launcher.md for master-detail launcher

render 0.2.0 added a transitive dep on lib-core.composition.
Engine resolver is strict-strcmp (no semver expansion), so
consumers must declare every transitive lib in deps[].

README.md

@@ -113,3 +113,43 @@ SPOREL_CI=1 ./Sporel.exe --module=map-editor   # exits with rc=0 after ~0.5 s
 - Design paper: `docs/design/2026-05-28-autotile-blob-styles-design.md`
   §11 in `sporel-meta`
 - Plan: `docs/superpowers/plans/2026-05-28-map-editor-blob-v2.md`
+
+## Menu UI (v0.3.0)
+
+Top toolbar replaced with a seven-category menu bar (File, Edit, View,
+Map, Tools, Window, Help) plus a sticky two-segment Mode-pill on the
+right end. Item types: action, modal, toggle, submenu, separator;
+items can be conditionally disabled. A single-stack modal framework
+hosts the existing Cheatsheet (I) and three new modals: Save As, Map
+Properties (read-only), About. The Esc key cascades modal -> menu ->
+quit.
+
+New Map and Open Map appear in the File menu as disabled placeholders
+pending a v3-aware maps.create and an engine.asset.list_dir in a
+future engine + lib slice.
+
+All previous hotkeys (Tab, S, E, R, H, 0, D, G, I, Esc) continue to
+work; their bindings are documented in the items where applicable
+and in the in-editor Cheatsheet modal.
+
+## Cell-Tile Mode (v0.3.1)
+
+Third painting mechanic alongside Auto-Tile and Direct. LMB paints a
+per-cell material flag at the cursor cell; RMB clears it. The
+renderer uses the classical 47-blob 8-neighbour bitmask for
+cell-tile cells, unlocking the 9 atlas slots that Auto-Tile's
+dual-grid 4-corner rule structurally cannot reach (isolated, end,
+corner_open, straight, tee_open, tee_half, cross_open, cross_q1,
+cross_q2adj).
+
+Auto-Tile (vertex-paint, 5 reachable slots, dual-grid look) and
+Direct (manual override placement, all 14 slots via explicit pick)
+are unchanged. Tab cycles through all three modes.
+
+For clean visuals, use a single painting mode per layer. Mixing
+Vertex-Tile and Cell-Tile material in the same layer is allowed but
+produces an asymmetric seam at the boundary because vertex-tile
+cells are structurally blind to their cell-tile neighbours.
+
+See `sporel-meta/docs/superpowers/specs/2026-06-01-map-editor-cell-tile-mode-design.md`
+for the full design rationale and the Boris-taxonomy background.

manifest.launcher.md

@@ -0,0 +1,17 @@
+---
+{"summary":"Map editor — vertical layer-chip overlay + atlas-tile picker","author":"calic","tags":["tool","map-editor"],"teaser_images":[]}
+---
+
+# Map Editor
+
+Click-to-paint tile editor with collapsible atlas/tile-picker. Vertical layer-chip overlay (left), atlas+tile picker (bottom-left), status chip (bottom-right).
+
+## Controls
+
+- Mouse-left on grid: paint
+- Mouse-left on layer-chip: switch active layer
+- Mouse-right on layer-chip: toggle visibility
+- E: erase mode
+- R: rotate
+- S: save
+- ESC: quit to launcher

manifest.module

@@ -1,6 +1,6 @@
 {
     "id": "map-editor",
-    "version": "0.2.0c.4",
+    "version": "0.3.3",
     "kind": "module",
     "api": "^0.1",
     "ci_frames": 30,
@@ -9,8 +9,9 @@
         "blob_rect_stone": "lib-asset.prototype-blob-geom"
     },
     "deps": [
-        {"id":"lib-core.maps","version":"0.5.6"},
+        {"id":"lib-core.maps","version":"0.5.7"},
-        {"id":"lib-core.render","version":"0.1.0"},
+        {"id":"lib-core.render","version":"0.2.0"},
+        {"id":"lib-core.composition","version":"0.1.0"},
         {"id":"lib-core.camera","version":"0.3.0"},
         {"id":"lib-core.input","version":"0.4.0"},
         {"id":"lib-asset.prototype-blob-geom","version":"0.1.0"}