Add weeknote for January 4-10, 2026 and fix list template excerpts

- New weeknote covering the week's shipped work, reading, gaming, cooking, and observations
- Fixed list templates to show description excerpts consistently across main index and weeknotes page
- Updated layouts/_default/list.html to check .Params.description before .Description
- Updated layouts/weeknotes/single.html to display full excerpts with reading time

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

layouts/_default/list.html

@@ -17,6 +17,8 @@
             <div>
               {{ if .Params.preview }}
                 <br />{{ .Params.preview }}<br />(more inside)<br /><br />
+              {{ else if .Params.description }}
+                <br />{{ .Params.description }}<br />(more inside)<br /><br />
               {{ else if .Description }}
                 <br />{{ .Description }}<br />(more inside)<br /><br />
               {{ else }}