fix: SPDX headers (AGPL→PMPL), email, author name

- AGPL-3.0-or-later → PMPL-1.0-or-later in SPDX-License-Identifier lines
- jonathan.jewell@open.ac.uk → j.d.a.jewell@open.ac.uk
- "hyperpolymath" → "Jonathan D.A. Jewell" in author fields

Part of global TODO cleanup (2026-03-16).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

rust/Cargo.toml

@@ -3,7 +3,7 @@
 name = "raze-core"
 version = "0.1.0"
 edition = "2021"
-license = "AGPL-3.0-or-later"
+license = "PMPL-1.0-or-later"
 description = "Rust core for RAZE-TUI polyglot TUI framework"
 repository = "https://github.com/hyperpolymath/raze-tui"