v0.22.0 — the agent can ask you things now

The agent can ask you things now. Give it an ambiguous task and instead of
guessing it asks — one question, a few concrete options, answered with a
keypress in the TUI, a tap on your phone, or a number on the CLI. It works in
every permission posture, because building the right thing matters more than
never being interrupted.

Plan mode also gained an exit. When the plan is ready the agent asks to start
implementing, and you choose how much leash to hand over: apply edits
automatically, confirm each one, or keep planning. It can never grant itself
unattended shell access — that stays a deliberate Shift+Tab.

New adaptive posture for when you don't want to be asked at all: the agent
starts read-only, writes its plan, then switches itself to editing when it is
ready. Shell commands still prompt, so the dangerous half stays leashed. The
footer tells you which phase it is in.

The TUI caught up too — a sidebar with live task progress, real context usage,
and session totals; and file edits now render as proper unified diffs with line
numbers instead of an escaped one-line blob. Plus a fix worth calling out: the
footer's context meter was showing only the window size, never what you had
actually used. brew upgrade krill.