atrium 0.40.0

Added

• Captions. With the mod, every pane reports what it is doing in a few
  words: from each tool call, free (running cargo test, editing filter.rs), and from the model's own streamed text by one small haiku
  call at most every twenty seconds, when a fleet says captions: true.
  The overview shows the caption in place of the transcript's last action; an
  unfocused tile draws it dim after the title; the turn's end clears it.
• The collision radar. The mod reports the real path of every edit that
  ran (report touched=<path>…); the broker keys it by the pane's worktree,
  so two worktrees' copies of one file are one file. The first time two live
  panes edit it, both wear ⚡ (tile badge and overview row), the overview
  lists the file under the agents, and one collision decision_needed goes
  to the nearest pane above both on the atrium topic. atrium ctl who <path> (and atrium_who) says which panes edited a file, with when and
  whether each is live.
• Ask without interrupting. atrium ctl ask <target> [--timeout S] <question> queues a question that rides the target's inbox; its mod answers
  from a fork of the pane's own context ($.model.fork: no tools, the turn
  untouched, the transcript never leaving the pane) and reports the reply,
  which the waiting ask prints and atrium ctl asked <target> <id> reads
  again. Ctrl+A ? on a tile asks the focused pane what it is doing, what it
  needs and what blocks it, and opens the reply as an overlay; atrium_ask
  does the same from a pane. Subtree-scoped like send, capped, scrubbed and
  never in the audit log.
• Fleet key captions, whoami carries it; mod version 0.2.0, with the
  ask capability.

Changed

• Captions carry less, and the model-made one is opt-in. The caption a
  tool call makes named the whole first line of a Bash command — flags,
  KEY=value assignments, quoted text, paths — in ctl status, the overview
  and the tile title, for the whole fleet to read. It now names the program
  and its subcommand only (running cargo test, running git commit,
  running dev.py check): no flags, assignments, quotes, operators or URLs,
  no path but the program's own name, three words at most. And the six-word
  caption from the model's own streamed text — a second model call the text
  leaves the pane for — is now off unless the fleet says captions: true
  (it was on unless captions: false); the tool caption is free and always
  on.
• ctl who is subtree-scoped. It was classed read-only like list, so
  any caller, token or none, could list every pane's edited paths. It now
  needs a pane token, and a caller sees only the panes in its own tree, as
  status and ask do; the operator sees every pane.

Fixed

• An ask's slot comes back. A pane holds at most eight unanswered
  questions, but an answered ask counted as unanswered again once its reply
  expired (ten minutes), and a question the mod had taken but never answered
  stayed pending across a respawn: a pane asked eight times over a session
  refused every later ask for good. An expired reply now takes its ask with
  it (asked says so instead of waiting forever), and a pane's exit or
  respawn drops its in-flight questions along with the queued ones.
• Collision keys compare paths as the filesystem does. A touch was keyed
  relative to the pane's worktree or its cwd, so two panes in unrelated
  repos both editing README.md wore ⚡ and raised a collision; and the
  prefix check was spelled-exact, so a mod's C:/wt/a/src/x.rs under a
  worktree recorded as C:\wt\a (or a \\?\ path, or another drive-letter
  case) kept its absolute key and two worktrees never collided on Windows. A
  pane with no worktree now keys by the absolute path alone, and every path is
  compared in one spelling: \ as /, \\?\ stripped, and a path Windows
  wrote lowercased; ctl who finds a Windows file by any spelling. A report
  whose ask reply is refused still records its other fields and touches.
• Manual splits tile into a grid. Ctrl+A " / % halved only the focused
  pane, so every pane added by hand with one key joined a single 1×N strip
  (five " presses: five full-width slivers), while -n 4 and ctl spawn --here laid the same panes out 2×2. A split now re-tiles the whole window
  into the balanced near-square grid --here already uses, with the new pane
  where the key pointed: % in the next slot of the focused pane's line,
  " in its slot of the next line (not appended bottom-right, as the first
  cut of this fix and --here did). The window keeps the orientation the
  first key gave it (" columns, % rows), so a later key reflows the grid
  instead of transposing it; ctl spawn --here puts the worker beside its
  caller the same way. Two panes keep the plain split the key names, three
  make a line, four a 2×2, six a 2×3. Focus still lands on the new pane.
• Install docs name the linker prerequisite. cargo install atrium on a
  machine with a Rust toolchain but no C toolchain ends in linker `cc` not found (link.exe / gcc on Windows) after every crate compiled; the
  README's install section now says what to install per platform, why the
  cc spelling on a Windows machine means WSL or a stray linker override, and
  that a build from a clone needs the sibling nativelite crates beside it.