chore(licence): migrate license fields from PMPL-1.0-or-later to MPL-2.0 (#55)

Closes part of Item 2 of the 2026-05-26 estate tech-debt audit
follow-up (hyperpolymath/standards#196). Touches both Cargo.toml
and package.json in this dual-toolchain repo.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

Cargo.toml

@@ -1,4 +1,4 @@
-# SPDX-License-Identifier: PMPL-1.0-or-later
+# SPDX-License-Identifier: MPL-2.0
 #
 # PanLL eNSAID — Gossamer backend
 #
@@ -17,7 +17,7 @@ version = "0.2.0"
 description = "PanLL eNSAID - Environment for NeSy-Agentic Integrated Development (Gossamer backend)"
 authors = ["Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>"]
 edition = "2021"
-license = "PMPL-1.0-or-later"
+license = "MPL-2.0"
 repository = "https://github.com/hyperpolymath/panll"
 
 # Testable logic library — GTK/WebKit-free. `cargo test --lib` runs without

package.json

@@ -17,7 +17,7 @@
     "gossamer"
   ],
   "author": "Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>",
-  "license": "PMPL-1.0-or-later",
+  "license": "MPL-2.0",
   "dependencies": {
     "@rescript/runtime": "^12.2.0"
   }