Bump version to 0.2.1

ROADMAP.md

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+# Roadmap
+
+This file tracks planned PySentry work that is larger than a single bug fix.
+
+## Delivery And Packaging
+
+Keep a single portable binary as the baseline delivery format. It is simple to
+test, easy to copy between machines, and matches the current storage model where
+runtime YAML files live next to the executable by default.
+
+Planned delivery variants:
+
+- Windows portable `.zip` with `pysentry.exe`, `README.md`, and `CHANGELOG.md`.
+- Linux portable `.tar.gz` archives for `linux-amd64` and `linux-arm64`.
+- Debian/Ubuntu `.deb` package once the Linux runtime paths are settled.
+- Windows installer later, likely Inno Setup first and MSI/WiX only if needed.
+- AppImage as a possible Linux GUI-friendly format after the core workflow is stable.
+- Flatpak only after the desktop integration story is clearer.
+- winget manifest after stable public Windows releases exist.
+
+Packaging design note:
+
+- Portable builds can keep settings and jobs next to the executable.
+- Installer/package builds should move runtime data to per-user locations:
+  `%APPDATA%\PySentry` on Windows, and XDG directories such as
+  `~/.config/pysentry` and `~/.local/share/pysentry` on Linux.
+
+Initial priority:
+
+1. Windows portable `.zip`.
+2. Linux portable `.tar.gz` for amd64 and arm64.
+3. Debian/Ubuntu `.deb`.
+4. Windows installer.