chore: remove unused CLI utility functions and improve version handling

[pyramation]

Summary

Removes unused utility functions from both CLI packages (pgpm/cli and packages/cli) that were defined but never called anywhere in the codebase.

Removed from pgpm/cli/src/utils/argv.ts:

• ValidatedArgv interface
• validateCommonArgs(), validateFlagDependencies(), logEffectiveArgs(), constructTarget() functions
• Associated Logger import (no longer needed)

Removed from both display.ts files:

• displayVersion() and displayUsage() functions
• Associated imports (findAndRequirePackageJson, yanse)

The actively-used exports (extractFirst, usageText) are preserved.

Updates since last revision

Refactored version handling in both CLI entry points (pgpm/cli/src/index.ts and packages/cli/src/index.ts) to use findAndRequirePackageJson instead of manual readFileSync + JSON.parse. This provides more robust package.json resolution and aligns with how version is handled elsewhere in the codebase (e.g., in commands.ts).

Review & Testing Checklist for Human

• Breaking change check: Verify no external packages or downstream consumers depend on the removed exports (displayVersion, displayUsage, validateCommonArgs, ValidatedArgv, etc.) - these were part of the public API via export * from './utils'
• Test pgpm --version and cnc --version to confirm they output the correct version
• Test pgpm --help and cnc --help to confirm CLI still works correctly

Recommended test plan:

# Build both packages
pnpm --filter pgpm run build
pnpm --filter @constructive-io/cli run build

# Test version commands
node pgpm/cli/dist/index.js --version
node packages/cli/dist/index.js --version

# Test help commands
node pgpm/cli/dist/index.js --help
node packages/cli/dist/index.js --help

Notes

These functions appear to be AI-generated code that was never integrated into the actual CLI flow. The user specifically requested cleanup of "AI slop" that hadn't been cleaned up.

Link to Devin run: https://app.devin.ai/sessions/8d1619b099e34c379f020eb65afd5828
Requested by: Dan Lynch (@pyramation)

[devin-ai-integration]

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