feat: port arbor, dharma, forge El source into monorepo

Brings the remaining foundation repos that were not included in the
original monorepo consolidation:

- arbor/vessels/ — 6 vessels (arbor-cli, arbor-core, arbor-diagram,
  arbor-layout, arbor-parse, arbor-render) with manifests + src/main.el
- dharma/ — CGI Provenance Registry package (flat layout, 14 .el files
  across registry/, sandbox/, training/, validation/, tests/)
- forge/ — consciousness channel tool (8 src .el files + new manifest.el)
- elp/src/ — 36 test fixture files not carried over in original merge
  (dedup_*, realizer_*, semantics_*, morph_*, ext_*, one_extern_* helpers)

el-ide, engram, elql are already complete in ide/, engram/, ql/.

arbor/vessels/arbor-core/manifest.el

@@ -0,0 +1,18 @@
+// arbor-core — fundamental types for Arbor diagrams.
+// Node IDs (sanitised), shape vocabulary, edge kinds, and the lightweight
+// graph value used by every other vessel.
+
+vessel "arbor-core" {
+    version "0.1.0"
+    description "Core types for Arbor diagrams: NodeId, ArborShape, ArborEdgeKind, graphs"
+    authors ["Neuron Technologies"]
+    edition "2026"
+}
+
+dependencies {
+}
+
+build {
+    entry "src/main.el"
+    output "dist/"
+}