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).

manifest.module

@@ -1,6 +1,6 @@
 {
     "id": "vagrant-skeleton",
-    "version": "0.19.0",
+    "version": "0.20.0",
     "kind": "module",
     "api": "^0.1",
     "ci_frames": 60,