feat: chain condition steps — defeasible/logical evidence as final chain hop

A chain's FINAL (object-side) step may now reference a defeasible/logical
evidence. The compiler lowers it to a condition step
({ rule: <config>, conditionStep: true }) that the engine verifies at
(intermediate, object) instead of traversing an edge. Requires
@arbiter/core@^1.0.3 (ChainRule condition-step support).

- _expandChainSteps: a logical/defeasible/comparator evidence is expressible
  as a final condition step; non-final such steps remain a compile error
  (a condition cannot discover intermediate nodes).
- Dependency collection (generator + DSLRuntime) descends into condition-step
  rule configs, so partial-graph requirements reach through them.

Tests: ChainConditionStep (defeasible + ALWAYS steps, independent checkability,
parallel aggregation), oracle campaign chain_condition_step construct
(oracle = min(pm, pv*(1-pb))), DSLRuntime transitive required facts through a
condition step.

package-lock.json

@@ -1,15 +1,15 @@
 {
   "name": "@arbiter/evidence-dsl",
-  "version": "1.1.0",
+  "version": "1.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@arbiter/evidence-dsl",
-      "version": "1.1.0",
+      "version": "1.4.0",
       "license": "ISC",
       "dependencies": {
-        "@arbiter/core": "^1.0.2"
+        "@arbiter/core": "^1.0.3"
       },
       "devDependencies": {
         "@rigor/core": "^3.1.0",
@@ -17,9 +17,9 @@
       }
     },
     "node_modules/@arbiter/core": {
-      "version": "1.0.2",
-      "resolved": "https://hub.kl1.tenere.ai/api/packages/Arbiter/npm/%40arbiter%2Fcore/-/1.0.2/core-1.0.2.tgz",
-      "integrity": "sha512-N1duiHy1Rlsxqpvu8uPf4tMaLOQ2tNXvGs53jLkRcIAYqafIAMvcf0BPS2iE2xVKNsqY92+F05bZZEAO5jnbyQ==",
+      "version": "1.0.3",
+      "resolved": "https://hub.kl1.tenere.ai/api/packages/Arbiter/npm/%40arbiter%2Fcore/-/1.0.3/core-1.0.3.tgz",
+      "integrity": "sha512-MCXxyeWBoYjEJMrdO8N8q9uEdX7JgDvwRH39D+8x65zFz+JCNWIQ8H4DgsP2rgF+yzv/cdVH4BX9PfFt6i0ftQ==",
       "license": "ISC",
       "dependencies": {
         "@tenere/pltc-core": "^0.6.3",