Release v0.2.1

[F16shen]

Release Notes

This PR prepares aish v0.2.1 for release.

Added

• Added an interactive plan mode for non-trivial tasks, including persisted plan artifacts, review and approval flow, and an explicit transition back into execution.
• Enter plan mode with /plan or F2.
• Leave plan mode with /plan exit or F2 again to return to normal shell execution.
• Added persistent long-term memory backed by Markdown storage, with memory recall and store tooling that can carry forward user preferences and project context across sessions.
• Added aish update and aish uninstall commands so archive, pip, and system-package installs have a built-in path for upgrade and removal.

Changed

• Changed the terminal UI to show a visible thinking timer while the model is working, making longer requests easier to track.
• Changed startup and session wiring so plan mode, memory, and the new CLI management flows are initialized more consistently from the current package layout.

Fixed

• Fixed the interactive shell so quit works again as an exit alias.
• Fixed compact prompt theme spacing and related prompt rendering regressions in the shell UI.
• Fixed release automation paths so preparation and publishing workflows target the current repository layout.
• Fixed the update-manager test so release version bumps do not break the suite with a hard-coded version assertion.

Release Files

• Bumped version to 0.2.1 in pyproject.toml, src/aish/__init__.py, and uv.lock.
• Added the 0.2.1 changelog section.

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