chore: scrub personal gmail from docs/configs (estate-wide sweep)

Replaced jonathan.jewell@gmail.com with j.d.a.jewell@open.ac.uk per
the hyperpolymath author-attribution rule (the gmail is banned;
j.d.a.jewell@open.ac.uk is the canonical non-Git-context address).

PLACEHOLDERS files got a generic user-old@example.com so they remain
useful as templates.

.mailmap files in this repo (if any) are intentionally left — they
are the legitimate git mechanism for remapping historical commits
authored under the old gmail to the correct open.ac.uk address.

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

Author: hyperpolymath

rhodium-standard-repositories/satellites/cccp/satellites/sanctify-php/README.adoc

@@ -1,6 +1,6 @@
 = Sanctify-PHP
 :author: Jonathan D.A. Jewell
-:email: jonathan.jewell@gmail.com
+:email: j.d.a.jewell@open.ac.uk
 :toc:
 :icons: font
 

rhodium-standard-repositories/satellites/cccp/satellites/sanctify-php/sanctify-php.cabal

@@ -14,7 +14,7 @@ description:
 license:            PMPL-1.0-or-later
 license-file:       LICENSE
 author:             Jonathan D.A. Jewell
-maintainer:         jonathan.jewell@gmail.com
+maintainer:         j.d.a.jewell@open.ac.uk
 category:           Development, Security
 build-type:         Simple
 extra-doc-files:    README.adoc

rhodium-standard-repositories/satellites/palimpsest-license/README.adoc

@@ -1,5 +1,5 @@
 = palimpsest-license
-Jonathan D.A. Jewell <jonathan.jewell@gmail.com>
+Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
 :toc: macro
 :icons: font
 :source-highlighter: rouge

rhodium-standard-repositories/satellites/robot-repo-automaton/README.adoc

@@ -1,5 +1,5 @@
 = robot-repo-bot
-Jonathan D.A. Jewell <jonathan.jewell@gmail.com>
+Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
 :toc: macro
 :icons: font
 :source-highlighter: rouge

rhodium-standard-repositories/satellites/well-known-ecosystem/README.adoc

@@ -1,5 +1,5 @@
 = well-known-ecosystem
-Jonathan D.A. Jewell <jonathan.jewell@gmail.com>
+Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
 :toc: macro
 :icons: font
 :source-highlighter: rouge