chore(license): migrate PMPL-1.0-or-later → MPL-2.0 (solo) (#23)

Replace LICENSE file with canonical MPL-2.0 text and update package
metadata (Cargo.toml/package.json/deno.json/mix.exs/pyproject.toml where
present) to declare the new SPDX identifier.

Rationale: solo.

Part of estate-wide metadata cleanup 2026-05-26.

Author: hyperpolymath

geo/Cargo.toml

@@ -5,7 +5,7 @@ version = "0.1.0"
 edition = "2021"
 authors = ["Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>"]
 description = "Geospatial extension for Lith - spatial indexing without compromising auditability"
-license = "PMPL-1.0-or-later"
+license = "MPL-2.0"
 repository = "https://github.com/hyperpolymath/lithoglyph-geo"
 keywords = ["lithoglyph", "geospatial", "spatial-index", "r-tree", "gis"]
 categories = ["database", "science::geo"]

studio/Cargo.toml

@@ -4,7 +4,7 @@ name = "lithoglyph-studio"
 version = "0.1.0"
 description = "Zero-friction interface for Lith with dependently-typed GQL"
 authors = ["Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>"]
-license = "PMPL-1.0-or-later"
+license = "MPL-2.0"
 repository = "https://github.com/hyperpolymath/lithoglyph-studio"
 edition = "2021"