refactor(cli): simplify arg parsing with generic transforms, remove --browser-compatible

[pyramation]

refactor(cli): simplify arg parsing, remove --browser-compatible

Builds on PR #691 (devin/1770496336-fix-ast-regression). The CLI cleanup is the final commit (13c06dfc8); the rest of the diff is from the parent branch's ORM-as-core refactor + AST regression fix.

Summary

Replaces the manual field-by-field CLI argument parsing with a generic transform pipeline, and removes the deprecated --browser-compatible flag entirely.

Before: Both CLI entry points had ~3 redundant layers duplicated across each file:

1. Manual cliOverrides object built with per-field if-statements checking both argv['kebab-case'] and argv.camelCase
2. A hasNonInteractiveArgs guard re-listing every flag a third time
3. Post-prompt field-by-field mapping into generate() options

After: Generic utilities in shared.ts:

• hyphenateKeys / camelizeArgv — bidirectional key transforms
• flattenDbFields / buildDbConfig — flatten/nest the db.schemas/db.apiNames structure
• seedArgvFromConfig — merge config file values into argv (config as defaults, CLI flags override)
• buildGenerateOptions — camelize answers, nest db fields, merge with full config

Core flow becomes:

const seeded = seedArgvFromConfig(argv, fileConfig);
const answers = await prompter.prompt(seeded, codegenQuestions);
const options = buildGenerateOptions(answers, fileConfig);
const result = await generate(options);

packages/cli/src/commands/codegen.ts: 160 → 71 lines
graphql/codegen/src/cli/index.ts: 239 → 148 lines

Review & Testing Checklist for Human

• Test config + CLI override flow: Run graphql-codegen --config ./config.ts --output ./override — verify CLI flags override config values while config-only fields (tables, hooks, queryKeys) pass through unchanged
• Verify key round-trip: Check that schemaFile → schema-file → schemaFile works correctly through the transform chain. Edge cases: apiNames, reactQuery, dryRun
• Test interactive prompting: Run graphql-codegen with no config and no CLI flags — verify prompts appear and work
• Test multi-target config: The standalone CLI still has multi-target loop logic — verify it works with a multi-target config file
• Breaking change: --browser-compatible is removed. Anyone passing this flag will get no error but the flag is silently ignored

Notes

• The test mocks in packages/cli/__tests__/codegen.test.ts bypass the real transform logic — they mock seedArgvFromConfig as pass-through. Real integration testing is needed.
• This PR is branched from devin/1770496336-fix-ast-regression (PR fix(codegen): convert string concatenation to Babel AST and template-copy patterns #691). The cumulative diff to main is large because it includes the ORM-as-core refactor. The CLI cleanup is the final commit.

---

Link to Devin run: https://app.devin.ai/sessions/a93d427c49214dce877d1fedee950c04
Requested by: @pyramation

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring