v0.2.0

The release that came out of using riff on real pull requests every day.

Added

• Three views, one key apart — i the PR overview, a the feed, d the diff, and the
  key of the view you are in takes you back. Each keeps its own position.
• A feed of what happened — commits, comments, reviews, checks and force-pushes in one
  stream, narrowed by a letter per kind, Enter on a row taking you where it lives.
• The overview says what is true, once — description, preview links, conversation,
  checks with annotations, approvals, commits and files, with the header carrying whose
  move it is and whether the PR is stacked on another.
• riff remembers when you last looked — what arrived since your last visit is marked,
  and ]n/[n walk it.
• Long lines — the diff scrolls sideways with the cursor, zw soft-wraps, gl peeks
  the whole line, and the status bar says which column you are in.
• Markdown, drawn — tables as a grid with aligned columns, mermaid blocks as diagrams,
  HTML in comments translated rather than printed, and Tab for the version being replaced.
• Syntax highlighting from the file itself, so a hunk that starts inside a block comment
  is a comment; GraphQL and Terraform added.
• s labels the rows of every list — the tree, the overview, the feed, the comments
  panel — and one keystroke jumps.
• Suggestions — Ctrl-y writes a ```suggestion block for the lines the comment
  replaces, and a comment written on a selection covers that whole block.
• Links you can follow — #412 resolved to its title and state, gx listing every link
  in the view, gX copying instead.
• Commit ranges — mark commits in Ctrl-g with Space and V, read them as one diff.
• A second thread on a line: writing a comment starts a thread, r replies.
• Emoji by shortcode — : and two letters in the composer.
• gd/gD diff a file's two versions in $EDITOR or a tmux pane; ge/gE open it.
• Folds for fenced blocks, expanding context as a one-way action, kept drafts, the code
  an outdated comment was written against, and images named with O to open them.
• The PR your branch already has — named in the header in local mode, one action away.

Changed

• Ctrl-f is the file picker everywhere; / is what narrows the list you are in.
• One comment store per repo in local mode: riff, riff @- and riff abc123 are the same
  review, and notes filed by an older riff are moved in on first load.
• The commit picker is a list you mark rather than a search box, and says which changes are
  empty.
• gd/gD mean the editor diff always; Claude's drafted comments moved to the palette.
• A refresh changes the data and nothing else — no lost position, no reset folds.

Fixed

• Reactions were written to GitHub but never read back.
• A subprocess could print its output over the screen; a picker opened from the palette
  could scroll it.
• The confirmation dialog's y/n went to the panel behind it.
• g? and gx were swallowed by the overview and the comments panel.
• Jumping to a resolved thread landed on a collapsed header, hiding the comment asked for.
• Picking a file from the overview moved the cursor somewhere you could not see.
• The composer jumped when the mention or emoji picker appeared.