feat(dev): provision a Prisma shadow database for dev leases

[simoncrypta]

Prisma migrate dev fails with P3014 because dev lease roles cannot create databases. Dev acquisition now provisions a dedicated role-owned shadow database alongside the main database on one admin connection, preserving the worktree hash when names need shortening.

AcquireResult.shadowDatabaseUrl, CLI JSON/env output, cedarpg run / run --attach, and the dev env file/loaders expose the shadow URL. Re-acquiring keeps both databases; existing role-scoped fresh acquisition, dispose, and GC remove both. README and changelog document the Prisma config opt-in and the one-time re-acquire for existing leases.

Validation:

• vp check: formatting, lint, and type checking pass.
• vp test: 145 tests pass across 23 files.
• vp run smoke: dual ESM/CJS packaging and export resolution pass.
• vp run smoke:pg: Vitest, Jest, TEMPLATE clone reuse/reset, CLI URL forwarding, and dev shadow checks pass. Prisma 7 generates an initial migration, deploys it, and generates a second migration through run --attach, with CREATEDB still disabled. Live checks also verify re-acquire preserves data and fresh/dispose/GC clean up both databases.

The registered host was unavailable locally, so the live smoke ran against a temporary cluster using autopg's bundled Postgres binary and an attach-only discovery shim. The shared host was not restarted or upgraded, and temporary cluster cleanup stayed under /tmp.

Closes #54

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commit: 3148a53