docs: add FSM states diagram screenshot

Reference screenshot of the FSM-states panel from the temp controller
architecture diagram (states, thresholds, and the HOLD->HEAT no-reset
bumpless-transfer note).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DGQhVQ2Y3yXAQTXhrxVd5u
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2026-07-05 21:59:20 +02:00
co-authored by Claude Sonnet 5
parent f69d63c31b
commit acfb98e186
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