feat: port LitClock to a Go terminal interface

.gitattributes

@@ -1,4 +1,4 @@
-# Rendered manual booklets (#404) are generated artifacts (build.sh). Chromium
-# print-to-pdf embeds a creation timestamp, so bytes change every rebuild —
-# mark binary so git doesn't attempt (noisy, useless) textual diffs.
-docs/manual/*.pdf -diff -text
+* text=auto
+*.go text eol=lf
+*.md text eol=lf
+*.csv text eol=lf

.github/dependabot.yml

@@ -1,23 +1,10 @@
 version: 2
-
 updates:
-  # GitHub Actions — surface security updates and action bumps.
-  # Reviewed manually; rebuilds only happen on demand, not on a schedule.
-  - package-ecosystem: "github-actions"
-    directory: "/"
+  - package-ecosystem: gomod
+    directory: /
     schedule:
-      interval: "monthly"
-    open-pull-requests-limit: 5
-    labels:
-      - "dependencies"
-      - "ci"
-
-  # Python runtime dependencies baked into the Pi image.
-  - package-ecosystem: "pip"
-    directory: "/"
+      interval: weekly
+  - package-ecosystem: github-actions
+    directory: /
     schedule:
-      interval: "monthly"
-    open-pull-requests-limit: 5
-    labels:
-      - "dependencies"
-      - "python"
+      interval: weekly