chore: v0.2.6 — Docker build on bun, prod-only runtime image

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## v0.2.6 — 2026-09-16 22:41
+- `Dockerfile`: install stages switched from npm to bun (`oven/bun:1.4.2-alpine`, `bun install --frozen-lockfile`); `package-lock.json` replaced by `bun.lock`; no BuildKit `type=cache` mounts — they don't persist across builds on this daemon, and bun install is fast enough (~3 s cold) that cross-build caching isn't worth it
+- `Dockerfile`: new `prod-deps` stage (`bun install --production`) so the runtime image carries prod-only `node_modules` — devDeps (typescript, vitest, @types) are no longer shipped; build and runtime stages otherwise unchanged (still node:22-alpine, full `.next`, no standalone output)
+- `.dockerignore`: excludes docs/deployment files (`*.md`, `Dockerfile*`, `docker-compose*`) from the build context so changelog-only commits don't invalidate the COPY layer and re-run `next build`
+- Verified: full cold build 77 s → 58 s; e2e suite 3/3 green against the rebuilt compose instance
+
 ## v0.2.5 — 2026-09-16 21:22
 - `AGENTS.md`: new "E2E tests (mandatory)" section codifies the e2e workflow — the compose instance behind Traefik (`https://flight.dev.kkhost.pl`) is always the app under test, never a local `next dev` on :3000; deploy current code first with `docker compose up -d --build`; browsers run through the shared remote Playwright server at `192.168.1.4:3000`, and plain `npx playwright test` handles deploy + readiness + remote connect
 - `playwright.config.ts`: dropped the `E2E_LOCAL=1` local-dev path accordingly — no more local :3000 dev instance for e2e; the default (and only) mode is browsers on the shared remote Playwright server against the prod build behind Traefik, with `webServer` running `docker compose up -d --build`; `E2E_REMOTE=1` and explicit `PW_TEST_CONNECT_WS_ENDPOINT`/`E2E_BASE_URL` overrides are unchanged