chore: adopt Dart 3.9 toolchain — honest floor + tall-style reformat (T-353)
Raise the declared minimums in pubspec.yaml to what our deps already require: Flutter >=3.35.0 / Dart >=3.9.0 (was 3.19.0 / 3.5.0). alchemist 0.12 needs Flutter 3.32; Dart 3.9 first ships in Flutter 3.35, so 3.35 is the binding floor. Pin the exact build toolchain in .fvmrc (Flutter 3.44.1). Moving to the Dart 3.9 language level switches `dart format` to the new "tall" style and enables two new lints. This commit is the resulting mechanical churn, isolated from any behaviour change: - whole-tree `dart format` reformat (tall style) - `dart fix` for unnecessary_underscores + use_null_aware_elements No runtime behaviour change; `make test` green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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@@ -37,8 +37,12 @@ coverage_floor: 95
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# flutter_channel: stable
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environment:
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sdk: ">=3.5.0 <4.0.0"
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flutter: ">=3.19.0"
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# Honest minimums (not aspirational floors). Drivers: alchemist 0.12 needs
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# Flutter >=3.32; markdown 7.3.1 needs Dart ^3.9.0, and Dart 3.9 first ships
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# in Flutter 3.35 — so 3.35 is the binding floor. Exact toolchain is pinned
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# in .fvmrc (T-353).
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sdk: ">=3.9.0 <4.0.0"
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flutter: ">=3.35.0"
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dependencies:
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flutter:
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