All user-facing output now goes through a single ui.Writer with a
uniform style:
》 (white) for begin / info / notice
》 (green) for complete / success
Warning: for warnings (orange)
ERROR: for errors (red)
》 (indented) for progress heartbeats
Color is enabled when stdout is a TTY and NO_COLOR is unset.
Standards:
- Complete-sentence messages with fully qualified terms ("backup
destination store", "local index database", "snapshot source
files enumeration").
- Every Complete has a matching Begin.
- Natural verb tense conveys state ("Uploading" -> "Uploaded"). The
words "begin"/"complete" never appear in message bodies; the marker
color carries that information.
- ETA means clock time, not duration. Progress lines say "estimated
remaining time (<dur>), finish at <time>" with both labeled.
Adds globals.CommitDate (populated by Makefile/Dockerfile/goreleaser
via ldflags from `git show -s --format=%cI HEAD`) and a startup banner
printed once per invocation.
Strips fx call-chain noise from startup errors so users see the actual
underlying error (e.g. "creating base path: mkdir /Volumes/BACKUPS:
permission denied" instead of three layers of "could not build
arguments for function ...").
README documents the output style and the ui package conventions.
sneak
00d4b36e35