MechaCat02 2ba476aac8 feat(cli): env-scoped overlays — --env merges picloud.<env>.toml ...

The §4.1 base+overlay model for the single-app world: a base `picloud.toml`
holds the shared scripts/routes/triggers; a sparse `picloud.<env>.toml`
carries the per-environment slug (+ extra secret names). `pic plan/apply
--env <E>` merges the overlay onto the base before diffing/applying, so an
environment deploys to its own app ("an environment is an app", §2)
without duplicating the shared definitions.

Merge is sparse: overlay `app.slug`/`name` replace the base's; secret
names union. Scripts/routes/triggers always come from the base. Rich
per-key `vars` resolution stays Phase 3.

Tested: unit tests for the merge + overlay-path derivation; a journey
proving `apply --env staging` deploys to the staging app and leaves the
base app untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-23 20:58:04 +02:00

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