Add licensing and provenance documentation

Docs/CODE_PROVENANCE.md

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+# WowRadio-Vanilla code provenance
+
+Audit date: 2026-08-31
+
+## Provenance chain
+
+### Historical addon
+
+The addon metadata and surviving historical documentation credit:
+
+- Tormentor @ Mannoroth
+- belthazor
+- jack.e for initial GUI and ideas
+
+### Vanilla backport
+
+Repository:
+- https://github.com/Daribon/WowRadio
+
+Its README identifies:
+- WowRadio v0.4 — 2006-12-25
+- WowRadio v0.4a — 2015-08-30
+- v0.4a as "Backported to vanilla"
+
+No project-wide LICENSE file was present when checked during this audit.
+
+### 2026 Vanilla maintenance
+
+Repository:
+- https://github.com/paokkerkir/WowRadio-Vanilla
+
+This repository updated the addon substantially in 2026 and is the immediate
+upstream source for the current fork's early history.
+
+No project-wide LICENSE file was present when checked during this audit.
+
+### Current maintained fork
+
+Repository:
+- https://github.com/Dusk-92/WowRadio-Vanilla
+
+Dusk-92 maintains later changes including station updates, UI changes,
+stability fixes, and optimization work.
+
+## Ace2 provenance
+
+The complete current `Libs/` Git tree SHA-1 is:
+
+`c29ef4a8a5c3b390f7fb968cb8f0f1917670170c`
+
+The same tree SHA appears in:
+
+- `Dusk-92/WowRadio-Vanilla`
+- `paokkerkir/WowRadio-Vanilla`
+- `Daribon/WowRadio`
+
+This establishes that the embedded Ace2 library tree was inherited unchanged
+through that known chain.
+
+The official WowAce project page identifies Ace2 as LGPL v2.1, with AceOO-2.0
+under MIT.
+
+## Licensing boundary
+
+A public Git repository or historical addon archive is not, by itself, proof of
+a permissive software license.
+
+Because no explicit project-wide license was identified for the historical
+WowRadio code, this project records provenance rather than inventing a license.
+
+Dusk-92's original modifications remain distinct from inherited code, Ace2
+libraries, station names/URLs, and visual assets.