chore: release 1.2.0

CHANGELOG.md

@@ -7,6 +7,32 @@ git history.)
 This project follows [Keep a Changelog](https://keepachangelog.com/) and
 [Semantic Versioning](https://semver.org/): the version number is `MAJOR.MINOR.PATCH`.
 
+## 1.2.0 - 2026-06-12
+
+### Added
+- **DA-07: channel serial numbers.** The Channels view now shows each channel's
+  sensor (CT) serial number, read live from the station, and the channel columns
+  now lay themselves out correctly when you switch between devices.
+
+### Fixed
+A round of testing against a real DA-07 station fixed problems that made the
+module hard to use on hardware (the simulator never showed them):
+
+- **DA-07 setting changes no longer undo themselves.** The station accepts a
+  change but never reports it back, so the screen used to silently revert to the
+  old value at the next routine update — every edit looked like it hadn't taken.
+- **Changing several DA-07 settings quickly no longer loses most of them.** The
+  station drops commands that arrive in a burst, so changes now queue and send
+  one at a time — the footer shows "Working" while queued changes finish sending.
+- **DA-07 channel details no longer come through garbled.** A field in the
+  station's channel records was being mis-read, scrambling the sensor serial
+  information on real hardware.
+- **A small empty window no longer flickers on screen** when a tool rebuilds its
+  tables (visible in all tools, most often during the DA-07's initial load).
+
+### Internal
+- Maintenance and under-the-hood improvements.
+
 ## 1.1.0 - 2026-06-11
 
 ### Added

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "cim-service-suite"
-version = "1.1.0"
+version = "1.2.0"
 description = "DA-12 Monitoring Station Service Tool (modern rebuild)"
 requires-python = ">=3.11"
 dependencies = ["PySide6>=6.7", "pyserial>=3.5", "openpyxl>=3.1", "PySideSix-Frameless-Window>=0.8"]