Add Sprints 46-59: governance, porting foundation, and language graduation prep (Steps 689-828)

Sprints 46-58 implement the cross-language porting foundation: language-to-IR
adapters, equivalence checking, gate validation, legacy ingestion, managed/dynamic
families, low-level/logic-actor semantics, debug workflow tooling, AST-native
family tools, Rust/CPP raising tools, system-level orchestration, query family,
and porting gates. Sprint 59 adds the governance layer (policy packs, review
boards, waiver packets, ambiguity triage, decision ledger) with the
whetstone_review_porting_decision MCP tool.

Also includes: sprint plans 46-130, MCP taskitem pipeline scripts,
CLAUDE.md, docs, and full test matrix (steps 689-828).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/examples/sprint46_semantic_core_example.json

@@ -0,0 +1,32 @@
+{
+  "moduleId": "example-mod",
+  "moduleName": "Example",
+  "nodes": [
+    {
+      "id": "m1",
+      "kind": "module",
+      "name": "Example",
+      "language": "rust",
+      "intentTags": ["stateful"],
+      "annotations": {},
+      "metadata": {}
+    },
+    {
+      "id": "f1",
+      "kind": "function",
+      "name": "run",
+      "language": "rust",
+      "intentTags": ["algorithmic"],
+      "annotations": {},
+      "metadata": {}
+    }
+  ],
+  "edges": [
+    {"fromId": "m1", "toId": "f1", "relation": "contains"}
+  ],
+  "contracts": {
+    "preconditions": ["input_valid"],
+    "postconditions": ["output_nonempty"]
+  },
+  "extras": {}
+}