chore: RSR compliance — LICENSE to PMPL-1.0-or-later, SPDX header in .editorconfig, fix AGPL refs in CITATIONS.adoc and .machines_readable/6scm/, fix author attribution

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

Author: hyperpolymath

.editorconfig

@@ -1,4 +1,5 @@
-# RSR-template-repo - Editor Configuration
+# SPDX-License-Identifier: PMPL-1.0-or-later
+# seamstress - Editor Configuration
 # https://editorconfig.org
 
 root = true

.machines_readable/6scm/ECOSYSTEM.scm

@@ -1,4 +1,4 @@
-;; SPDX-License-Identifier: AGPL-3.0-or-later
+;; SPDX-License-Identifier: PMPL-1.0-or-later
 ;; ECOSYSTEM.scm - Ecosystem relationships for rsr-template-repo
 ;; Media-Type: application/vnd.ecosystem+scm
 

.machines_readable/6scm/META.scm

@@ -1,4 +1,4 @@
-;; SPDX-License-Identifier: AGPL-3.0-or-later
+;; SPDX-License-Identifier: PMPL-1.0-or-later
 ;; META.scm - Architectural decisions and project meta-information
 ;; Media-Type: application/meta+scheme
 

.machines_readable/6scm/STATE.scm

@@ -1,4 +1,4 @@
-;; SPDX-License-Identifier: AGPL-3.0-or-later
+;; SPDX-License-Identifier: PMPL-1.0-or-later
 ;; STATE.scm - Project state tracking for rsr-template-repo
 ;; Media-Type: application/vnd.state+scm