docs: add architecture/dev sections to README and create CONTRIBUTING.md

Add --host flag to control server bind address (#1) (#3)

fix(ci): move build before tests for static file serving

fix(ci): create empty test database for server smoke tests

ci: add CI pipeline with type check, lint, tests, and build

Stabilize data flow and refactor the activity graph (#6)

perf: remove 24h session filter and defer first-poll loading

refactor: phase 2 — structural cleanup (#5)

refactor: phase 1 cleanup — dead code, error handling, deps (#4)

Merge pull request #2 from Postmodum37/feat/update-performance

fix(client): fix fetch race conditions and migrate sidebar to granular contexts

fix(client): suppress lint errors in new context files

test(client): add Playwright tests for card sizing and build output

test(client): add context isolation and edge stability tests

perf(client): code-split GraphView and vendor chunks