docs(move): reference upstream Move tooling

Document the compiler-first ingestion flow and link contributors to Aptos Core, MoveFlow 2.0.0, and the Move Book.

Co-authored-by: Cursor <cursoragent@cursor.com>

gitnexus/src/core/move/README.md

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+# Move compiler integration
+
+This directory implements GitNexus's compiler-first ingestion for Move packages.
+GitNexus discovers packages from `Move.toml`, communicates with `move-flow` over
+MCP, and projects compiler facts into the standard GitNexus knowledge graph.
+Declaration and semantic data come from the compiler-backed `facts` and
+`call_graph` queries rather than raw-source parsing.
+
+```text
+Move package
+  -> move-flow MCP
+  -> compiler facts and call graph
+  -> GitNexus nodes and relationships
+  -> consistency validation
+```
+
+## Components
+
+- `mcp-client.ts` owns the `move-flow mcp` process, JSON-RPC transport, and the
+  client contract consumed by ingestion.
+- `compiler-facts.ts` defines the normalized compiler response shapes used by
+  downstream projections.
+- `move-ingest.ts` implements the standalone ingestion phase, including package
+  discovery, compiler queries, and cross-package resolution.
+- `facts-mapper.ts` maps compiler facts to deterministic GitNexus nodes and
+  relationships.
+- `consistency.ts` validates the resulting graph and reports incomplete or
+  malformed compiler evidence.
+
+## Upstream references
+
+- [Aptos Core](https://github.com/aptos-labs/aptos-core) contains the upstream
+  Move compiler and runtime. MoveFlow releases are built from matching
+  `move-flow-v<version>` tags in this repository.
+- [MoveFlow in Aptos AI](https://github.com/aptos-labs/aptos-ai) provides the
+  `move-flow` binary and MCP tools consumed by this integration. GitNexus
+  currently targets
+  [MoveFlow 2.0.0](https://github.com/aptos-labs/aptos-ai/releases/tag/move-flow-v2.0.0).
+- [The Move Book](https://aptos-labs.github.io/move-book/) is the language
+  reference for Move concepts represented in the graph.