fix(readme): correct stale Lean declaration count 217→626 (canonical §10)

README.md

@@ -21,7 +21,7 @@ tags:
   - dependency
   - mathlib
   - dataset
-pretty_name: "Lean Theorem Tree — 217-Declaration Graph"
+pretty_name: "Lean Theorem Tree — 626-Declaration Graph"
 size_categories:
   - n<1K
 task_categories:
@@ -29,7 +29,7 @@ task_categories:
 ecosystem-stage: generated-mirror
 ---
 
-# Lean Theorem Tree — 217-Declaration Graph
+# Lean Theorem Tree — 626-Declaration Graph
 
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.20434276.svg)](https://doi.org/10.5281/zenodo.20434276)
 [![Lean Kernel Green](https://img.shields.io/badge/Lean_4.13--kernel--green@7ef33a6-22c55e?style=flat-square)](https://github.com/szl-holdings/lutar-lean/commit/7ef33a6)
@@ -42,7 +42,7 @@ ecosystem-stage: generated-mirror
 
 > **Doctrine v7.** No marketing. Every number resolves to a CI log, a Lean proof, or a Zenodo DOI.
 
-Dependency graph of all 217 Lean 4 declarations in the Ouroboros formal verification corpus. Records include: declaration name, type, dependencies, axiom usage flags, sorry status, and Mathlib 4.13.0 compatibility.
+Dependency graph of all 626 Lean 4 declarations in the Ouroboros formal verification corpus. Records include: declaration name, type, dependencies, axiom usage flags, sorry status, and Mathlib 4.13.0 compatibility.
 
 5 declarations carry sorry (down from 7 after [PR #109](https://github.com/szl-holdings/lutar-lean/pull/109) discharged P6 and P7). The tree is used by the [lutar-lean-browser space](https://huggingface.co/spaces/SZLHOLDINGS/lutar-lean-browser) for interactive navigation.