add publish infrastructure and update docs for public release

- publish/manifest: explicit file allowlist for public repo
- publish/CLAUDE.md: sanitized version (no personal data paths)
- publish/extract_config.example.yaml: generic paths and owner
- publish.sh: orphan-branch publish script (single squashed commit)
- site/.env.example: documents BINCIO_DATA_DIR and PUBLIC_EDIT_URL
- README.md: updated pipeline diagram, quick start, project layout
- CHEATSHEET.md: added bincio render and bincio edit sections,
  sidecar format reference, updated daily workflow

README.md

@@ -19,9 +19,10 @@ GPX / FIT / TCX files
         │
         ▼
   ~/bincio_data/          ← BAS data store. Human-readable JSON + GeoJSON.
+   edits/*.md             ← Optional sidecar edits (titles, descriptions, photos).
         │
         ▼
-  bincio render / npm     ← Astro build. Reads JSON, writes static HTML/JS/CSS.
+  bincio render           ← Merges sidecars → _merged/. Runs Astro build.
         │
         ▼
   site/dist/              ← Drop anywhere. Open index.html. Done.
@@ -46,17 +47,19 @@ bincio extract
 
 # 4. Build the site (requires Node >= 20)
 cd site && npm install
-ln -sf ~/bincio_data public/data
-npm run build
+cp .env.example .env        # configure BINCIO_DATA_DIR
+bincio render               # merges edits + runs astro build
 # → open site/dist/index.html
 ```
 
 For live development with hot reload:
 ```bash
-cd site
-ln -sf ~/bincio_data public/data
-npm run dev
+bincio render --serve       # merges edits, links data, starts astro dev
 # → http://localhost:4321
+
+# Optional: enable the activity edit UI
+bincio edit                 # starts edit server on http://localhost:4041
+# Set PUBLIC_EDIT_URL=http://localhost:4041 in site/.env
 ```
 
 ---
@@ -207,7 +210,11 @@ bincio/                 Python package
     strava_csv.py       Strava activities.csv reader
     writer.py           BAS JSON + GeoJSON writer
   render/
-    cli.py              `bincio render` stub
+    cli.py              `bincio render` — merge + astro build/serve
+    merge.py            sidecar edit overlay (produces _merged/)
+  edit/
+    cli.py              `bincio edit` — local edit server
+    server.py           FastAPI write API for the edit drawer
 schema/
   bas-v1.schema.json    JSON Schema for BAS format
 SCHEMA.md               Human-readable BAS specification
@@ -219,10 +226,11 @@ site/                   Astro project
       stats/index.astro         Yearly heatmaps + totals
     components/
       ActivityFeed.svelte        Card grid, sport filter, pagination
-      ActivityDetail.svelte      Map + stats + charts
+      ActivityDetail.svelte      Map + stats + charts + photo gallery
       ActivityMap.svelte         MapLibre GL map
       ActivityCharts.svelte      Observable Plot charts
       StatsView.svelte           Heatmap, percentile scaling, sport filter
+      EditDrawer.svelte          Slide-in activity editor
     lib/
       types.ts                  BAS TypeScript types
       format.ts                 Formatting helpers