e142032f

By: Michael Lynch <git@mtlynch.io>

Stamp Go binaries with VCS metadata via Stapelberg overlay

The /about page reads vcs.revision and vcs.time from the binary's build
info, but Nix builds from a source copy without .git, so Go embedded no
VCS metadata and the version table stayed empty.

Apply stapelberg/nix's goVcsStamping overlay and build the Go packages
from `src = self` so Go stamps the flake's commit and last-modified time.
Verified `go version -m` now reports vcs.revision/vcs.time/vcs.modified.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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