check_for_updates() looked at __file__.parent.parent for a .git dir to
diff against origin/main. A nix-built hermes lives in /nix/store with
no .git there, so the check fell through to whatever editable-install
dev checkout last populated ~/.hermes/.update_check, producing stale
"X commits behind" warnings right after a fresh `nix run --refresh`.
Embed the locked flake rev into the wrapper as HERMES_REVISION (only
on
clean builds — dirty refs don't represent any upstream commit). When
set, banner.py compares it to upstream main via `git ls-remote`
instead
of inspecting a local checkout, and the cache key includes the rev so
nix updates invalidate immediately. Without local history we can't
count commits, so the message is a plain "update available" with no
suggested command — nix users may install via `nix run`, profile,
system flake, or home-manager, and we don't know which.
Also bump web/package-lock.json npmDepsHash via `nix run
.#fix-lockfiles`.
9fc9c15b4a