Signing was account-wide (gpg.format/user.signingkey/commit.gpgsign in
~/.gitconfig), so every repository was signed. Now Settings → Git →
Commit signing lists the user's workspaces, each with its own key picker
("Don't sign" by default). PUT /api/me/git/signing/lane {laneId, key}
writes a small file of ours (lane-<id>.gitconfig beside the account's
keys; a member's through write-as) and includes it from ~/.gitconfig
with includeIf "gitdir:<the workspace's git dir>" and
"gitdir:<common dir>/worktrees/ah-<id>-*" (its sessions' worktrees) —
only that workspace signs, from the terminal, the Changes panel or an
agent, and nothing is written into the repository. The git dirs come
from git run in the workspace's folder as its account; a workspace that
runs as another account is EFOREIGN, a folder that is not a repo
ENOREPO. Stopping needs no workspace, so one removed from the dashboard
while it signed is still listed and can be turned off.
The card now lists the keys that can sign, each with Delete (confirm;
deleting a key stops every workspace signing with it), a way out of the
old account-wide setting, and Remove for a signing setup the user made
themselves (PUT /signing {clearForeign: true}: the three settings only,
never their key file). Importing a key no longer turns on signing.
Verified with real signatures: the picked workspace's commits are G,
another repo's and an unrelated worktree's N, a session worktree's G.
nntrivi2001
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