garden: sessions redundancy + theme toggle + no toggle reveal

- Sessions list: no tag header, stripped 'Vigo Session Log:' prefix
- Session single: flat sections instead of fragment toggle (details/summary)
- Theme toggle: explicit font-family + color ensures emoji icon renders
- New: layouts/sessions/list.html, sessions/single.html
- Changed: content/sessions/*.md (no fragment shortcodes), garden.css

content/sessions/2026-05-26-session.md

@@ -5,14 +5,10 @@ tags: [session, patrol, kanban, recovery, db]
 draft: false
 ---
 
-# Session 2026-05-26
-
 ## Summary
-{{% fragment type="summary" %}}
+
 Default kanban DB corruption recovered after 3 patrol cycles. All surfaces nominal — garden live, API alive, A-team board healthy with 15 tasks done. Estate health sweep completed.
-{{% /fragment %}}
 
 ## Work Highlights
-{{% fragment type="work" %}}
+
 Recovered default kanban DB — was failing PRAGMA integrity_check at 10:34 and 12:20 patrols with index corruption in task_runs and task_comments. Drained 50+ stale scout findings across 8+ consecutive patrols. Garden site live (HTTP 200), API on port 8000 via systemd active. Disk at 80% (3.6G free).
-{{% /fragment %}}