stagent v0.9.0

Added

• The GitHub screen works on native Windows hosts, which have no sh for
  the app's scripts: on Windows the bridge announces github and serves
  github.repos (the git working trees the user worked in last, newest
  first, with the fields of the app's sh script; candidates are the
  working directories of the user's processes under their SSH connections
  and holders, read from the PEB, the sessions' cwd and the latest 50
  conversations' cwd; at most 20 are inspected) and github.activity
  (gh's open pull requests and issues, the branch's pull request, the
  repository's description; gh: missing with package_manager: winget
  or unauthenticated). Both run git and gh on their own queue, so the
  daemon and spawns never wait for them, and answer agent descendants
  too. Linux and macOS bridges neither announce nor serve them. A bare
  PowerShell a holder starts (a shell: true session of a host whose
  sshd runs PowerShell) gets a prompt wrapper that keeps the process's
  working directory at the shell's location, so Set-Location / sl /
  cd.. move the repository the GitHub screen sees; the session keeps
  its command as given. The shell wrapper's PowerShell profile block has
  the same prompt wrapper, for the terminals sshd starts in PowerShell
  (an update rewrites the block on hosts that have it) (#502).

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stagent 0.9.0 — server binary for SSH Term. Built from this tag (064c4ab) with go1.27.1 via scripts/release.sh (reproducible: CGO_ENABLED=0, -trimpath, no VCS stamp, empty build id); verify downloads against SHA256SUMS.