Mirrors `pic vars` on the secrets surface: `pic secrets ls/set/rm` take an
`--app`/`--group` owner selector (exactly-one) with `--env` for group
secrets. Adds `pic secrets read --group <g> <name> [--env]` — the only
command that reveals a secret value, hitting the group-gated value
endpoint. `pic config --effective` now folds in the resolved vars section
(value + owner + scope) and an `--explain` provenance view, alongside the
existing masked-secrets cross-reference, via `GET /config/effective`.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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