feat(vagrant): rock template gains player-facing properties

Rock template now declares name="Rock", a description, weight (kg),
volume (L), and composition.stone=1.0. The module-side label_resolver
override is removed — display lib's default reads name now.

Inspect action prints a structured block (name, description, weight,
volume, composition.<material>, reg_id) to the console. Future
notification system will route this to an in-game text panel; for now
the console output makes Inspect useful instead of silent.

init.lua

@@ -1,4 +1,4 @@
--- sporel-module-vagrant-skeleton v0.9.0
+-- sporel-module-vagrant-skeleton v0.9.1
 -- Sprite-mode test-chamber: 13-bone humanoid puppet + sprite-tilemap +
 -- hardcoded furniture. Subterrain-style puppet control model:
 -- multi-look-target (aim/soft), slerp body rotation, hip-static legs,
@@ -27,6 +27,13 @@
 -- showing backpack contents. Right-click on an item row opens a context
 -- menu with Drop and Inspect actions. Q-drop (LIFO quick-drop) remains
 -- available in parallel.
+--
+-- v0.9.1: Rock template gains player-facing properties (name,
+-- description, weight, volume, composition.stone). Inspect prints the
+-- name+description+weight+composition block to the console; future
+-- notification system will route this to an in-game text panel. Module-
+-- side label_resolver override removed — default_label_resolver reads
+-- the `name` property.
 
 local input       = require("lib-core.input")
 local camera      = require("lib-core.camera")
@@ -81,6 +88,14 @@ composition.define_template{
     id = "rock",
     properties = {
         stack_mode   = "individual",           -- required by inventory-list
+        -- Player-facing properties (item-template-convention v0.x):
+        name         = "Rock",                 -- shown by inventory display
+        description  = "A heavy stone. Could be useful for crafting.",
+        weight       = 2.5,                    -- kg (real units)
+        volume       = 0.001,                  -- L (real units)
+        -- Material composition (composition-model.md §4 — 0-1 platonic;
+        -- 1.0 = pure stone). Phase E (property-driven recipes) reads this.
+        ["composition.stone"] = 1.0,
         sprite_atlas = "",
         sprite_uv    = {x = 0, y = 0, w = 1, h = 1},
         position     = {x = 0, y = 0},
@@ -405,11 +420,8 @@ function M.init(ctx)
         pause_on_open = false,
     })
 
-    -- Module-side label-resolver (display lib's default returns "Item").
-    -- Vagrant currently has one item template (rock); hardcoded for v0.9.
-    inv_display.set_label_resolver(backpack_widget, function(item)
-        return "Rock"
-    end)
+    -- Default label_resolver reads `name` property from the item-template
+    -- (set on the rock template above). No override needed in v0.9.1.
 
     -- Drop action: knows world-reparenting + player position
     inv_display.register_action(backpack_widget, "Drop", function(item, c)
@@ -423,9 +435,30 @@ function M.init(ctx)
         if CI_FRAME_PERF then engine.print("vagrant: event=drop_via_menu") end
     end)
 
-    -- Inspect action: dumps reg_id to console
+    -- Inspect action: prints player-facing item info to console. Future
+    -- notification-system (lib-core.toast or similar) will route this to
+    -- an in-game text panel instead of engine.print.
     inv_display.register_action(backpack_widget, "Inspect", function(item, c)
-        engine.print(string.format("vagrant: inspect: reg_id=%s",
+        local name        = item:get_property("name") or "(unnamed)"
+        local description = item:get_property("description") or ""
+        local weight      = item:get_property("weight") or 0
+        local volume      = item:get_property("volume") or 0
+        engine.print(string.format("=== %s ===", name))
+        if description ~= "" then engine.print(description) end
+        engine.print(string.format("weight=%.2fkg volume=%.3fL", weight, volume))
+        -- Surface material composition by iterating composition.* properties.
+        local props = item:get_properties()
+        local mats = {}
+        for k, v in pairs(props) do
+            local mat = k:match("^composition%.(.+)$")
+            if mat and mat ~= "reg_id" then
+                table.insert(mats, string.format("%s=%.2f", mat, v))
+            end
+        end
+        if #mats > 0 then
+            engine.print("composition: " .. table.concat(mats, " "))
+        end
+        engine.print(string.format("(reg_id=%s)",
             tostring(item:get_property("composition.reg_id"))))
         c.close_menu()
     end)