feat(pgpm): uniform --emit-sql/--emit-bundle projections on transform and import

[pyramation]

Summary

The composable SQL/bundle projections (added for pgpm diff in #1576) only lived on pgpm diff. This wires the same shared helpers into pgpm transform and pgpm import, so every dials command has identical --emit-* flags: the module is the canonical artifact, and linear SQL / bundle are pure projections of it (same packageModule / buildExecutableBundle machinery, no new semantic path).

New flags on both commands:

• --emit-sql <file|-> — consolidated linear SQL (- = stdout)
• --emit-bundle <file> — content-addressed .bundle.tar.gz

Shared plumbing factored into utils/module-projections.ts so flag parsing stays byte-identical across diff/transform/import:

parseEmitProjectionTargets(argv, cwd) -> { emitSql?, emitBundle? }  // resolves paths, keeps `-` sentinel
hasEmitProjection(targets) -> boolean
projectModule(dir, targets, onSuccess?)                            // runs emitModuleSql / emitModuleBundle

Command flow (both commands): write the module dir as before, then, when a projection is requested, run projectModule(writtenDir, emit, ...).

Guards (these projections are single-module by nature):

• rejected when a workspace transform spans multiple modules
• rejected when --partition fans out into >1 package
• rejected together with --dry-run
• --emit-sql - suppresses the human-readable log.* lines so stdout stays valid SQL

Tests

transform-e2e and import-e2e each gain a "compose module + linear SQL + bundle from one run" case (asserts the module pgpm.plan exists, the linear SQL contains the expected CREATE SCHEMA/CREATE TABLE in plan order, and the bundle archive reads back with changes). Full local run: transform-e2e + import-e2e 16/16, diff-e2e 8/8.

Roadmap: finishes the "uniform projections across all commands" follow-up from #1340 (Parts A–C); pgpm diff already had these flags via #1576.

Link to Devin session: https://app.devin.ai/sessions/798445577ac8487abf80e28f9ff7a916
Requested by: @pyramation

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