Bump TerminalGuiVersion to 2.4.15-develop.31 (needs fixes)

[tig]

Automated bump of TerminalGuiVersion from 2.4.14-develop.2 to 2.4.15-develop.31 failed validation (build or tests).

Editor needs source changes to absorb this Terminal.Gui update. See the
failed workflow run.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Resolve obsolete config APIs before bumping

This new default package version is used by every project restore, but Terminal.Gui 2.4.15-develop.31 now marks the configuration APIs we still use (SettingsScope / ConfigurationPropertyAttribute, e.g. src/Terminal.Gui.Editor/Editor.Commands.cs:24) as obsolete. Because this repo builds with TreatWarningsAsErrors, the bump workflow for this exact version reports those diagnostics as errors, so the solution is left unbuildable before tests can run. Please migrate or explicitly handle those diagnostics before raising the dependency floor.

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[tig]

Superseded by #264 (merged): develop is now migrated to Terminal.Gui's MEC config path and pinned to stable 2.4.15, which resolves the CS0618 build break these auto-bump PRs hit. Closing and deleting the branch.