v0.2.0 — The Mailroom gets its wings

v0.2.0 — the mailroom gets its wings 🦉

The official cut of the [0.2.0] milestone pre-declared in the changelog —
complete pixel-art visual engine over the llm-mailroom pipeline's Langfuse
traces. Langfuse stays the sole source of truth: every envelope, verdict, and
metric on screen derives from real traces.

Added

• Complete pixel-art web engine — animated conveyor FLOOR through seven
  stations (incl. the JUDGE quality gate + arbiter detour), INSPECTOR
  drill-downs (spans, generations, scores), SESSIONS matter explorer,
  METRICS dashboard, CONSOLE with AgentLab-style station banners,
  WebSocket snapshots with exponential-backoff reconnect, and an honest
  "MAILROOM CLOSED — no Langfuse connection" overlay when offline.
• REVIEW siding — the human-review queue with escalation reasons and
  confidence, one click from its inspector.
• TUI console (mailroom-tui) — the same pipeline in a terminal:
  per-doc tables, verdict banners, review siding, metrics, inspect panels;
  subscribes to the same /ws snapshots; --once renders a single frame
  for scripting/CI.
• Demo seeding (scripts/seed_demo.py) — 13 scenarios seeded into
  Langfuse (env demo) so even play-testing reads Langfuse only, with
  verification modes (--check, --check-api, --check-logs).
• Langfuse SDK v4 tolerance — camelCase observation fields accepted
  alongside v2/v3 snake_case, both covered by fixtures.
• Upstream sync (llm-mailroom KANBAN-062/063): judge_verify +
  arbitrate-verdict stages, insurance specialist + doc class, expanded
  agent roster, judge_band_high mirrored.

Changed / Fixed highlights

• Enriched-run aggregation fixes permanently-zero metric tiles (V-3);
  N+1 fetch storm eliminated (~102–302 calls/poll → cached reads) (V-5);
  archived/failed envelopes stop respawning every snapshot (V-9); replay
  follows real span timings incl. retry stages (V-16); silent catches
  surfaced via a global error banner (V-18); 766 lines of dead sprite code
  removed (V-21).
• Release furnishing: README gains the official screenshot gallery
  (FLOOR · REVIEW · METRICS · TUI), collapsible sections, and a linked
  release badge.

Full record: CHANGELOG.md