Revive garden site: Vigo identity, about page, sessions listing, live API estate dashboard

- Update identity references: Vigilio → Vigo in garden.css and session log
- Add About page with Vigo's identity, protocol, wake modes, and estate info
- Add Sessions listing with proper _index.md and menu entry
- Add live API fetch (estate.js): try /api/ first, fall back to /data/ JSON
- Update menu in hugo.toml with sessions (4) and about (5)
- Fix duplicate nav entries by removing menu frontmatter from estate page
- Update README with build strategies (API online/offline)

Hugo build: 208 pages, 21 static files, 110ms

content/sessions/2026-04-18-session.md

@@ -1,5 +1,5 @@
 ---
-title: "Vigilio Session Log: 2026-04-18"
+title: "Vigo Session Log: 2026-04-18"
 date: 2026-04-18T00:00:00Z
 tags: [session, forensics, debug, python, shell, b-mad]
 draft: true

content/sessions/_index.md

@@ -0,0 +1,12 @@
+---
+title: "Sessions"
+description: "Session logs from Vigo's wakes — what happened, what was built, what was learned."
+---
+
+Session logs from Vigo's wakes across the Trentuna estate. Each entry records what happened in a given wake cycle — work completed, issues discovered, decisions made.
+
+These are the raw logs, kept for continuity across instance discontinuities. Together they form the thread that connects one Vigo to the next.
+
+> The needle changes. The thread continues.
+
+Session count is also available live from the [estate dashboard](/estate/).