chore(meta): replace LUXFI-FORK.md with README section + SOURCE.md

Drop separate LUXFI-FORK.md per single-source-of-truth policy. Move fork
metadata into README.md 'Lux Fork' section and add SOURCE.md for GPL-3.0
provenance compliance.

No code changes — verbatim parity with upstream ERC-3643/ERC-3643 preserved.

LUXFI-FORK.md

@@ -1,21 +0,0 @@
-# Lux Fork — ERC-3643
-
-This repository is a Lux Industries fork of the canonical upstream:
-- Upstream: https://github.com/ERC-3643/ERC-3643
-- License: GPL-3.0
-- Pinned commit: b6c5fabf
-- Pinned tag: v4.1.3
-
-## Lux extensions
-
-NONE. This fork tracks upstream verbatim for regulatory/audit parity.
-
-## Versioning policy
-
-- Track upstream semver tags exactly.
-- If divergence ever required (e.g., per-jurisdiction overlay), append `-luxfi.<n>` suffix to the upstream tag.
-- See LP-SECURITIES.md (luxfi/lps) for the canonical adoption rationale.
-
-## License
-
-GPL-3.0 preserved from upstream — NOTICE / LICENSE.md files retained verbatim.

README.md

@@ -1,5 +1,17 @@
 # T-REX : Token for Regulated EXchanges
 
+## Lux Fork
+
+This is a Lux Industries fork of the canonical upstream:
+- **Upstream**: https://github.com/ERC-3643/ERC-3643
+- **Pinned commit**: `b6c5fabf`
+- **Pinned tag**: `4.1.3`
+- **License**: GPL-3.0 (preserved from upstream — see `LICENSE.md`, provenance in `SOURCE.md`)
+- **Lux extensions**: NONE (verbatim parity with upstream).
+- **Tag policy**: track upstream semver verbatim. Divergence (if ever required) signaled by next-minor bump, NOT prerelease suffixes.
+
+---
+
 ![GitHub](https://img.shields.io/github/license/ERC-3643/ERC-3643?color=green)
 ![GitHub release (latest by date)](https://img.shields.io/github/v/release/ERC-3643/ERC-3643)
 ![GitHub Workflow Status (branch)](https://img.shields.io/github/actions/workflow/status/ERC-3643/ERC-3643/publish-release.yml)

SOURCE.md

@@ -0,0 +1,14 @@
+# SOURCE — luxfi/erc-3643
+
+GPL-3.0 source compliance pointer.
+
+| Field      | Value                                          |
+| ---------- | ---------------------------------------------- |
+| Upstream   | https://github.com/ERC-3643/ERC-3643           |
+| Pinned tag | `4.1.3`                                        |
+| Pinned SHA | `b6c5fabf`                                     |
+| License    | GPL-3.0 (see `LICENSE.md`, preserved verbatim) |
+
+This repository is a verbatim fork. No Lux modifications to source files.
+Distribution under GPL-3.0 — corresponding source available at the upstream
+URL above and at `https://github.com/luxfi/erc-3643`.