crafting: retire form, unify on affordance capability axis (ADR-0055 amendment)

Recipe roles now match on a single `affordance.*` axis, required by both consumed `inputs` and non-consumed `tools` (the inputs/tools split carries consumption, not a separate axis). `form` — which conflated geometry, identity and capability — is removed. Its functional members folded into affordances (blade->cutting, shaft->leverage, plus knappable/spinnable/binding); identity members became template-id (chop_tree) or material+weight (log, hammer head).

vagrant-skeleton v0.20.0; no crafting/composition lib bump (they never knew `form`). Verified headless via the tool-harness: 16/16 checks pass — role-flexibility (stick OR branch hafts), weight discrimination, tool-gating (tool not consumed), and anti-recursion guards (sharp_stone not re-knappable, cordage not re-spinnable).

init.lua

@@ -181,7 +181,9 @@ composition.define_template{
         description  = "A heavy stone. Could be useful for crafting.",
         weight       = 2.5,                    -- kg (real units)
         volume       = 0.001,                  -- L (real units)
-        form         = "lump",                 -- role: a knappable/poundable stone
+        -- Affordance = what the item OFFERS (ADR-0055 amendment): a raw
+        -- stone chunk affords being knapped (flaked into an edge).
+        ["affordance.knappable"] = true,
         -- Material composition (composition-model.md §4 — 0-1 platonic;
         -- 1.0 = pure stone). Phase E (property-driven recipes) reads this.
         ["composition.stone"] = 1.0,
@@ -205,7 +207,10 @@ composition.define_template{
         description  = "A wooden stick. Useful for crafting tool handles.",
         weight       = 0.3,                    -- kg
         volume       = 0.0005,                 -- L
-        form         = "shaft",                -- role: a light rigid shaft (handle)
+        -- Affordance (ADR-0055 amendment): a rigid shaft affords leverage —
+        -- i.e. it can serve as a haft/handle. weight (light) distinguishes
+        -- it from a heavy branch in weight-gated recipes.
+        ["affordance.leverage"] = true,
         ["composition.wood"] = 1.0,
         sprite_atlas = "",
         sprite_uv    = {x = 0, y = 0, w = 1, h = 1},
@@ -644,7 +649,11 @@ function M.init(ctx)
             position     = { x = 0, y = 0 },
         }
         if a.scale then props.sprite_scale = a.scale * (d.scale or 1) end
-        if d.form then props.form = d.form end   -- role tag: shaft / cord / fiber / lump / blade / …
+        -- Two orthogonal axes (ADR-0055 + amendment): `material` = composition
+        -- fractions (what it's MADE OF), `affordance` = capabilities it OFFERS
+        -- (what it can DO / what role it fills). `form` was retired — its
+        -- functional members folded into affordance, its identity members
+        -- into template-id / material+weight.
         for m, v in pairs(d.material   or {}) do props["composition." .. m] = v end
         for k, v in pairs(d.affordance or {}) do props["affordance."  .. k] = v end
         composition.define_template{ id = d.id, properties = props, tags = { "renderable", "item" } }