- public API streamline
- Failf[T]("msg") - originate a failure from a message; embed a cause with %w
- Err[T](err) - sets .err verbatim (the return zero, err / sentinel case)
- store build metadata (version, commit, date)
- multi-binary build: `make build` builds all packages from ./cmd
- devcontainer adds ./bin to the PATH by default
README: slim to landing-page essentials; add "Design forces" section
explaining why pkg/result and pkg/logger exist (form over mechanism).
Remove stale API docs — those live in package comments.
CLAUDE.md: add "form over mechanism" design principle; update logging
rule to document NewCLI two-mode model; add v0.4.0 to recent work.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
