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

publish/extract_config.example.yaml

@@ -0,0 +1,31 @@
+owner:
+  handle: yourname
+  display_name: Your Name
+
+input:
+  dirs:
+    - ~/Activities/gpx
+    - ~/Activities/fit
+  # Strava bulk export metadata — provides names, descriptions, gear
+  # metadata_csv: ~/strava_export/activities.csv
+
+output:
+  dir: ~/bincio_data
+
+default_privacy: public
+
+sensors:
+  heart_rate: true
+  cadence: true
+  temperature: true
+  power: true
+
+track:
+  simplify: rdp
+  rdp_epsilon: 0.0001   # ~11m at equator
+  timeseries_hz: 1       # 1 sample/second max
+
+classifier:
+  enabled: false          # ML activity type classifier (requires scikit-learn extra)
+
+incremental: true         # skip files whose hash hasn't changed since last run