docs: add .claude-context overview + session log

.claude-context/00-overview.md

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+# Frambe — Project Overview
+
+Frambe is a self-hosted, single-container web app that turns older tablets and
+spare screens into digital photo frames, backed by an Immich server. The browser
+client pulls photos (by album, person, favorites, or random) from Immich via a
+thin Node/Express proxy and runs a full-screen slideshow with clock, EXIF, blur
+background, and transition effects. Designed to run well on old/low-power browsers.
+
+**Stack:** Node.js + Express server (`server.js`), vanilla-JS frontend
+(`public/js/app.js`), Docker + docker-compose deployment. No build step on the
+frontend. Immich creds passed via compose `environment:` (`IMMICH_URL`,
+`IMMICH_API_KEY`).
+
+**Current version:** 1.6.0 (on `dev`) — Immich v3 API compatibility.
+
+**Deployment:** hal-blackpearl, container on host port 3030. Repo on self-hosted
+Gitea (`jessikitty/frambe`). Release flow: work on `dev`, merge to `main` when
+confirmed. Files uploaded via scp+ssh (Gitea API truncates files >~16KB, and
+`server.js` is ~27KB).
+
+**Credit / footer:** "Created by: Jess Rogerson (yelling commands at Claude.AI)"
+
+## Session Log
+- 2026-09-23 — Immich v3 API Migration & Deploy Debugging — Updated all Immich API calls for v3 breaking changes (isShared/isOwned, search/metadata for album+person assets, search/random, ms duration); bumped to 1.6.0. Slideshow "no photos" traced to a missing `.env` breaking docker-compose, not the code.