Add weeknotes system with /weeknotes command

- Create weeknotes archetype for manual post creation
- Add /weeknotes slash command that prompts through each section
  interactively (shipped, read, played, cooked, noticed, thinking, next)
- Add /weeknotes landing page explaining the concept
- Update CLAUDE.md with weeknotes documentation and voice guidelines

Weeknotes are brief weekly reflections—lighter than full posts, more
personal journal than polished article.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -52,12 +52,34 @@ hugo new content-name.md
 The blog uses the "m10c" theme but has two additional themes available (henry, kestrel). Theme switching is done via `config.toml`.
 
 ### Content Organization
-- `/content/posts/` - Blog posts
+
+- `/content/posts/` - Blog posts (including weeknotes)
 - `/content/now.md` - "Now" page showing current activities
 - `/content/then.md` - "Past" page with historical content
 - `/content/upcoming.md` - "Future" page with upcoming events
+- `/content/weeknotes.md` - Weeknotes landing page
 - `/content/mytweets.md` - Local tweet archive page
 
+### Weeknotes
+
+Weeknotes are short weekly reflections on what Eric shipped, read, played, cooked, and noticed. They use a lighter voice than full blog posts—more personal journal than polished article.
+
+**To create a weeknote**: Run `/weeknotes` to be prompted through each section interactively.
+
+**Manual creation**: `hugo new --kind weeknotes posts/YYYY-MM-DD-weeknotes.md`
+
+**Sections** (all optional—skip any that don't apply):
+
+- Shipped — projects, features, fixes, accomplishments
+- Read — books, articles, interesting finds
+- Played — games, experiments, fun projects
+- Cooked — recipes, Random Recipe Project work
+- Noticed — observations from garden, neighborhood, life
+- Thinking About — ideas brewing, problems being chewed on
+- What's Next — upcoming plans and goals
+
+**Voice for weeknotes**: Brief, punchy, concrete. Less polished than regular posts. Okay to be fragmentary. The goal is marking time and noticing patterns, not crafting essays.
+
 ### Menu Structure
 The site has four menu groups configured in `config.toml`:
 - **main**: Home and Tags navigation