feat(codegen-ts): jsonb value-object typing + collection-name control + shared VO module resolver

[dmealing]

Three independent codegen-ts adoption fixes that share the same render pipeline (so they land together to avoid intermingled-file rebases), plus a timestamp-mode config knob.

1. Postgres jsonb value objects

• field.object no longer emits a native .array() — an object array lives in one jsonb column, not jsonb[]. Suppressed when subType === object.
• jsonb object columns now carry .$type<VO>() / .$type<VO[]>() (the previous .$type path was sqlite-only, so Postgres object columns inferred unknown). Added an array flag to ColumnSpec.dollarTypeRef so the renderer picks single vs collection. Applies to single objects too, not just arrays.

2. Collection (table) variable naming control

• New config: pluralizeCollections (default true) + collectionNameOverrides (per-entity exact names). Surfaced as a single ctx.collectionName(entity) resolver used by every template that emits or references a table var (schema, queries, routes, relations, inferred types), so the declaration and all references stay consistent. Naming is a per-port codegen concern → config, not a metadata attribute → no cross-port conformance cost.

3. Shared value-object module resolver (consistency fix)

• New valueObjectModuleSpecifier() is the single source of truth feeding the three places that reference a VO module — the field's TS type, its Zod schema, and the Drizzle .$type<>(). Previously each hardcoded ./<VO>.js, wrong under package layout + cross-package refs and ignoring extStyle. Now layout/package/extStyle-aware (matching FK-reference resolution); proven by a two-package end-to-end fixture.

4. timestampMode

• "date" | "string" (default "string"), applied uniformly to the plain timestamp + timestamptz override branches, keeping the Drizzle column aligned with the generated Zod + the cross-port wire contract.

Compatibility & tests

Default config reproduces byte-identical output, so all golden/conformance fixtures are unchanged. New coverage: jsonb-VO column cases, the pluralize/override resolver, the VO module resolver (flat / same-pkg / cross-pkg / extStyle), and an end-to-end cross-package VO fixture asserting all three references resolve identically.

• codegen-ts 799/0
• codegen-ts-react/angular/tanstack + conformance 134/0
• migrate-ts 488/0
• cli 277/0

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