crafting: actor-precondition (requires) + reward (grants) — Skills half of Phase H (ADR-0056)

lib-core.crafting v0.4.0: two optional domain-free recipe fields.
- `requires`: a match-table evaluated against ctx.actor (not container items) — a hard gate. Failing -> {ok=false, error="requires_unmet", unmet={keys}}; fail-closed when ctx.actor is nil. Same predicate machinery as slots; distinct from is_known (discovery vs lock).
- `grants`: property->number reward, returned as `granted` from craft(); the consuming MODULE applies it to the actor (crafting stays container-scoped). Crafting knows no 'skill' vocabulary (ADR-0001).

vagrant-skeleton v0.21.0: player-actor carries skill.knapping (entity property, Phase-A lesson); knap_sharp_stone grants knapping XP, craft_stone_axe requires knapping>=3; module applies granted; skill-locked recipes show 'Skill too low'. Gate->earn->unlock loop headless-verified (axe locked @0 requires_unmet -> 3 knaps -> unlocks).

Quality-band reserved (Phase J): the requires threshold = the future quality floor (no re-authoring). Docs synced: ADR-0056, crafting-model.md (v0.4.0 + Actor-Precondition section), libraries.md, crafting README, vagrant README.

README.md

@@ -8,11 +8,20 @@ callback, foot-body-orientation ("tactical twist"), scale-deformation walk
 cycle, and inheritance-decoupled foot sprites. End-to-end inventory pickup/drop
 demo: pick up a rock into a backpack container, drop it back into the world.
 
-**Version:** 0.20.0
+**Version:** 0.21.0
 **Module-ID:** vagrant-skeleton
-**Requires:** lib-core.input >=0.4.0, lib-core.camera >=0.3.0, lib-core.render >=0.2.0, lib-core.maps >=0.1.2, lib-core.puppet >=0.4.4, lib-core.interaction >=0.1.0, lib-core.composition >=0.3.0, lib-core.actor >=0.1.0, lib-core.inventory-list >=0.1.0, lib-core.panel >=0.2.0, lib-core.inventory-list-display >=0.1.0, lib-core.notify >=0.1.0, lib-core.notify-display >=0.1.0, lib-core.world-overlay >=0.1.0, lib-core.crafting >=0.3.0, lib-core.crafting-display >=0.2.0, lib-asset.prototype-subterrain >=0.2.0, lib-asset.prototype-tc-basics >=0.1.0
+**Requires:** lib-core.input >=0.4.0, lib-core.camera >=0.3.0, lib-core.render >=0.2.0, lib-core.maps >=0.1.2, lib-core.puppet >=0.4.4, lib-core.interaction >=0.1.0, lib-core.composition >=0.3.0, lib-core.actor >=0.1.0, lib-core.inventory-list >=0.1.0, lib-core.panel >=0.2.0, lib-core.inventory-list-display >=0.1.0, lib-core.notify >=0.1.0, lib-core.notify-display >=0.1.0, lib-core.world-overlay >=0.1.0, lib-core.crafting >=0.4.0, lib-core.crafting-display >=0.2.0, lib-asset.prototype-subterrain >=0.2.0, lib-asset.prototype-tc-basics >=0.1.0
 **Tags:** test-chamber, puppet, walking-sim, interaction
 
+> **v0.21.0:** **Skill-gating (crafting v0.4.0 / ADR-0056).** Recipes can now gate
+> on and reward the ACTOR: the player-actor carries `skill.knapping` (an entity
+> property), `knap_sharp_stone` **grants** knapping-XP, and `craft_stone_axe`
+> **requires** `skill.knapping>=3`. The module applies the craft's returned
+> `granted` to the actor. Demonstrates the gate→earn→unlock loop (gate downstream,
+> grant upstream). Headless-verified: axe locked at skill 0 (`requires_unmet`) →
+> 3 knaps → axe unlocks. Skill-locked recipes show "Skill too low" instead of a
+> generic failure.
+>
 > **v0.20.0:** **`form` retired → `affordance` is the one capability axis**
 > (ADR-0055 amendment). The `form` role-tag mixed geometry, identity and
 > capability; it is gone. Its functional members folded into `affordance.*`

content/stone_age.lua

@@ -21,6 +21,12 @@
 -- `inputs` and non-consumed `tools`; the inputs/tools split (not a separate
 -- axis) says whether the item is used up.
 --
+-- ACTOR-SIDE (crafting v0.4 / ADR-0056): a recipe may also gate on / reward the
+-- ACTOR, not the ingredients:
+--   * `requires = { ["skill.knapping"]=">=3" }` — hard gate vs ctx.actor
+--   * `grants   = { ["skill.knapping"]=1 }`     — XP given on successful craft
+-- Same predicate machine; the module applies `grants` to the actor.
+--
 -- `form` was RETIRED (ADR-0055 amendment): a physical-shape axis mixed
 -- geometry, identity and capability. Its functional members became
 -- affordances; its identity members (a "tree") stay template-id.
@@ -86,10 +92,13 @@ return function(c)
     -- ---- recipes (match by CAPABILITY, not by item id) --------------
     -- knap: any KNAPPABLE stone + a HAMMERING tool -> a cutting edge.
     -- (rock is knappable; sharp_stone is NOT → no self-recursion.)
+    -- Skill-ungated but GRANTS knapping XP (ADR-0056) — the accessible "grind"
+    -- recipe that bootstraps the gated craft_stone_axe below.
     c.R{ id = "knap_sharp_stone",
          inputs  = { { match = { ["affordance.knappable"] = true }, count = 1 } },
          tools   = { { match = { ["affordance.hammering"] = true } } },
          outputs = { { template = "sharp_stone", count = 1 } },
+         grants  = { ["skill.knapping"] = 1 },
          name = "Knap Sharp Stone",
          description = "Strike a stone with a hammerstone to flake off a sharp edge." }
 
@@ -115,15 +124,18 @@ return function(c)
          description = "Lash a stone to a haft for a pounding tool (enables knapping)." }
 
     -- axe: a CUTTING head + a LEVERAGE haft + a BINDING.
+    -- Skill-GATED (ADR-0056): needs knapping >=3, earned by knap_sharp_stone.
+    -- Demonstrates the gate+earn+unlock loop (gate downstream, grant upstream).
     c.R{ id = "craft_stone_axe",
          inputs = {
              { match = { ["affordance.cutting"]  = true }, count = 1 },  -- head (a sharp stone)
              { match = { ["affordance.leverage"] = true }, count = 1 },  -- haft
              { match = { ["affordance.binding"]  = true }, count = 1 },  -- binding
          },
+         requires = { ["skill.knapping"] = ">=3" },
          outputs  = { { template = "stone_axe", count = 1 } },
          name = "Haft Stone Axe",
-         description = "Bind a sharp stone to a haft with cordage." }
+         description = "Bind a sharp stone to a haft with cordage. (Needs knapping skill 3.)" }
 
     -- break: a HEAVY leverage-thing (branch, not a light stick) -> two sticks.
     c.R{ id = "break_branch",

init.lua

@@ -239,6 +239,10 @@ composition.define_template{
     properties = {
         position       = {x = 0, y = 0},
         movement_speed = 120,         -- WALK_SPEED_NORMAL
+        -- Skill as an actor entity-property (ADR-0056 / Phase-A lesson: NOT a
+        -- Lua-local, so the derivation machinery + get_property reach it).
+        -- Raw XP counter; recipe `requires`/`grants` gate/reward against it.
+        ["skill.knapping"] = 0,
     },
     tags = {},                         -- intentionally untagged: not renderable
 }
@@ -492,6 +496,22 @@ local function update_lower_anim(moving, move_x, move_y)
     end
 end
 
+-- Apply a craft's `granted` rewards (ADR-0056) to the actor: additive numeric
+-- accumulation (skill XP, etc.). crafting returns the reward; the module owns
+-- the actor-write (crafting stays container-scoped). Granted keys must be
+-- declared actor properties (see the vagrant_player template).
+local function apply_grants(actor_handle, granted)
+    if not granted then return end
+    for key, amount in pairs(granted) do
+        local cur = actor_handle:get_property(key) or 0
+        actor_handle:set_property(key, cur + amount)
+        if CI_FRAME_PERF then
+            engine.print(string.format("vagrant: grant %s +%s -> %s",
+                key, tostring(amount), tostring(cur + amount)))
+        end
+    end
+end
+
 function M.init(ctx)
     local aliases = engine.module.asset_aliases()
 
@@ -910,6 +930,7 @@ function M.init(ctx)
             local r = crafting.craft(recipe_id, c.container,
                 { actor = state.actor })
             if r.ok then
+                apply_grants(state.actor, r.granted)
                 local recipe = crafting.get_recipe(recipe_id)
                 notify.post{
                     tags     = {"craft", "event"},
@@ -923,6 +944,8 @@ function M.init(ctx)
                 local msg
                 if r.error == "missing_inputs" then
                     msg = "Missing inputs"
+                elseif r.error == "requires_unmet" then
+                    msg = "Skill too low: " .. table.concat(r.unmet or {}, ", ")
                 else
                     msg = "Cannot craft: " .. tostring(r.error)
                 end
@@ -993,6 +1016,7 @@ function M.init(ctx)
             local r = crafting.craft(recipe_id, ctx_inner.locale,
                 { actor = state.actor, at_workbench = true })
             if r.ok then
+                apply_grants(state.actor, r.granted)
                 local recipe = crafting.get_recipe(recipe_id)
                 notify.post{
                     tags     = {"craft", "event"},
@@ -1007,6 +1031,8 @@ function M.init(ctx)
                 local msg
                 if r.error == "missing_inputs" then
                     msg = "Missing inputs"
+                elseif r.error == "requires_unmet" then
+                    msg = "Skill too low: " .. table.concat(r.unmet or {}, ", ")
                 else
                     msg = "Cannot craft: " .. tostring(r.error)
                 end

manifest.module

@@ -1,6 +1,6 @@
 {
     "id": "vagrant-skeleton",
-    "version": "0.20.0",
+    "version": "0.21.0",
     "kind": "module",
     "api": "^0.1",
     "ci_frames": 60,
@@ -26,7 +26,7 @@
         {"id": "lib-core.puppet",                 "version": "0.5.0"},
         {"id": "lib-core.interaction",            "version": "0.1.0"},
         {"id": "lib-core.inventory-list",         "version": "0.1.0"},
-        {"id": "lib-core.crafting",               "version": "0.3.0"},
+        {"id": "lib-core.crafting",               "version": "0.4.0"},
         {"id": "lib-core.crafting-display",       "version": "0.3.0"},
         {"id": "lib-asset.prototype-subterrain",  "version": "0.2.0"},
         {"id": "lib-asset.prototype-blob-geom",   "version": "0.1.0"},