Fix architecture diagram card spacing

CHANGELOG.md

@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ### Fixed
 
+- Widen the architecture diagram's authority, evaluation, and result cards so
+  every label retains a clear inner margin at rendered browser font metrics.
 - Build the validated Pages deployment artifact explicitly before upload and
   confine Pages write permission to the deployment job after activation.
 - Make the wide mobile architecture illustration keyboard-focusable and add an

docs/IMPLEMENTATION_PLAN.md

@@ -1192,3 +1192,15 @@ Evidence: [Public Opening Decision](PUBLIC_OPENING_DECISION.md),
 
 Evidence: [Release Strategy](RELEASE.md), `AGENTS.md`, `CONTRIBUTING.md`, and
 GitHub branch protection for `master`.
+
+## Post-M69 - architecture diagram spacing
+
+- [x] Widen the three authority cards, central evaluation boundary, and two
+  result cards without reducing the established typography.
+- [x] Preserve the diagram's fixed view box, accessible description, responsive
+  horizontal-navigation behaviour, and shared README/website source asset.
+- [x] Measure every card's rendered text against its border in a browser and
+  retain at least 27 pixels of right-side clearance at native SVG scale.
+
+Evidence: `site/assets/telosieve-architecture.svg`,
+`scripts/validate-pages-site.py`, and browser-rendered layout measurements.