v0.5.1 — Dependabot cluster consolidated

Dependabot cluster consolidated into one release instead of ten sequential single-PR merges (avoids rebase-cascade on the other open branches, one release commit instead of ten atomic "Bump X from A to B"s).

Changed

• docker/login-action 3 → 4.5.2 (also fixes a Node.js 20 deprecation warning surfaced during the v0.5.0 builder run — GitHub forces Node 24 from 2026-06-02 and removes Node 20 entirely 2026-09-16)
• actions/setup-python 6.2.0 → 7.0.0
• actions/checkout 6.0.2 → 7.0.1
• qdrant/qdrant v1.17.1 → v1.18.3 (Dockerfile base for the sidecar binary)
• home-assistant/builder 2025.03.0 → 2026.06.0
• uvicorn 0.46.0 → 0.47.0
• ruff 0.15.12 → 0.15.13
• sentence-transformers 5.4.1 → 5.5.0
• qdrant-client 1.17.1 → 1.18.0
• einops 0.8.1 → 0.8.2

Notes

95 tests pass, ruff clean, no Python source changes apart from dependency version pins. CI's smoke build + docker run + /api/status poll all green.