feat(codegen): add CLI entry point generation option (cli.entryPoint)

[pyramation]

feat(codegen): add CLI entry point generation option (cli.entryPoint)

Summary

Adds a new opt-in entryPoint boolean to CliConfig (default false). When enabled, codegen generates an index.ts entry point file that bootstraps the CLI using inquirerer, handling --version, --tty false, and error reporting.

This follows the existing template-copy pattern used by cli-utils.ts and node-fetch.ts — the template lives in src/core/codegen/templates/cli-entry.ts and is read/header-replaced at codegen time.

Wired into both generateCli() (single-target) and generateMultiTargetCli() (multi-target) code paths, and passed through generateMulti() in generate.ts.

Motivation: Eliminates the runtime entry point generation hack in the constructive-hub CLI e2e test script (lines 44–69 of test-cli-e2e.sh), which manually creates this file at test time.

Updates since last revision

• Replaced hardcoded '0.0.1' version with getPackageJson(__dirname) from inquirerer, matching the exact pattern used by cnc and pgpm CLIs. The generated entry point now reads the actual version from the nearest package.json at runtime.

Review & Testing Checklist for Human

• getPackageJson(__dirname) runtime behavior — the generated index.ts calls getPackageJson(__dirname) to resolve the version for --version. Verify that when the generated CLI is compiled/bundled (e.g. via tsx or tsc), __dirname resolves to a path where a package.json is discoverable. If the CLI is run directly from source (e.g. npx tsx cli/index.ts), the nearest package.json might be the workspace root rather than the CLI-specific one.
• No new tests — 301 existing tests pass, but none exercise entryPoint: true. Consider adding a snapshot test that verifies the generated index.ts content.
• index.ts filename collision — verify no other codegen output produces an index.ts in the CLI output directory, since generateEntryPointFile() writes to index.ts.
• Single-target path guard — in generateCli(), the check is typeof cliConfig === 'object' && !!cliConfig.entryPoint. Confirm this is correct for all call sites (when cliConfig is true vs an object).

Suggested test plan

1. Add entryPoint: true to a codegen config YAML and run generation
2. Verify the generated index.ts contains the expected imports (getPackageJson) and CLI bootstrap
3. Verify entryPoint: false (or omitted) produces no index.ts
4. Run the generated CLI with --version and confirm it prints the version from the nearest package.json

Notes

• Build passes (pnpm build), all 301 tests pass (pnpm test), no snapshot changes
• Link to Devin run: https://app.devin.ai/sessions/d41228699b3a46de9e73cc13dda02882
• Requested by: @pyramation

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