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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`.