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/manifest

@@ -0,0 +1,59 @@
+# BincioActivity — public release manifest
+# One relative path per line.
+# If publish/<path> exists, that sanitized version is used instead of the original.
+
+.gitignore
+.python-version
+CHEATSHEET.md
+CLAUDE.md
+README.md
+SCHEMA.md
+pyproject.toml
+extract_config.example.yaml
+schema/bas-v1.schema.json
+bincio/__init__.py
+bincio/cli.py
+bincio/edit/__init__.py
+bincio/edit/cli.py
+bincio/edit/server.py
+bincio/extract/__init__.py
+bincio/extract/cli.py
+bincio/extract/config.py
+bincio/extract/dedup.py
+bincio/extract/metrics.py
+bincio/extract/models.py
+bincio/extract/parsers/__init__.py
+bincio/extract/parsers/base.py
+bincio/extract/parsers/factory.py
+bincio/extract/parsers/fit.py
+bincio/extract/parsers/gpx.py
+bincio/extract/parsers/tcx.py
+bincio/extract/simplify.py
+bincio/extract/sport.py
+bincio/extract/strava_csv.py
+bincio/extract/timeseries.py
+bincio/extract/writer.py
+bincio/render/__init__.py
+bincio/render/cli.py
+bincio/render/merge.py
+site/.env.example
+site/astro.config.mjs
+site/package.json
+site/tailwind.config.mjs
+site/tsconfig.json
+site/src/components/ActivityCharts.svelte
+site/src/components/ActivityDetail.svelte
+site/src/components/ActivityFeed.svelte
+site/src/components/ActivityMap.svelte
+site/src/components/EditDrawer.svelte
+site/src/components/StatsView.svelte
+site/src/layouts/Base.astro
+site/src/lib/format.ts
+site/src/lib/types.ts
+site/src/pages/activity/[id].astro
+site/src/pages/index.astro
+site/src/pages/stats/index.astro
+tests/__init__.py
+tests/test_merge.py
+tests/test_sport.py
+tests/test_writer.py