chore(main): release 1.2.0

[vovinacci]

🤖 I have created a release beep boop

1.2.0 (2026-07-21)

Features

• backend: OpenTelemetry instrumentation with trace IDs in logs (#162) (23170c3)
• backend: serve gRPC ItemService with event streaming (#161) (58fbd53)
• backend: split health contract into /healthz and /readyz (#156) (8ab8006)
• canary: Rust synthetic canary v1 behind synthetic profile (#159) (99d458a)
• observability: add blackbox_exporter behind synthetic profile (#158) (a50785f)
• proto: buf module with ItemService contract and CI gate (#160) (ebd57c1)

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[vovinacci]

🤖 Created releases:

• v1.2.0

🌻