Use the conventional .env / .env.example location at the repo
root instead of cfg/dev.env / cfg/dev.env.example. .env is what
contributors expect, keeps cfg/ a pure generated-config directory,
and shares the same file if we ever add another dev target that
needs the same overrides.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
Committing a fully-materialised cfg/dev.yaml hid the dev
configuration surface and blocked the OAuth2 signing-key inlining
change: the new config requires a per-dev private key that must
not be committed. Replace the checked-in file with a dev-config
Make target that shells out to probod-bootstrap with dev-safe
defaults and a stable RSA signing key stashed under
cfg/.dev-oauth2-signing-key.pem on first run.
The recipe sources cfg/dev.env when present so devs can override
any setting without editing the Makefile; cfg/dev.env.example
ships the full list of overridable knobs. cfg/dev.yaml,
cfg/dev.env, and the signing key are all gitignored.
Update README, CONTRIBUTING, and contrib/claude/config.md to
describe the new workflow.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>