refactor(inflekt): remove camelize, standardize on toCamelCase/toPascalCase

[pyramation]

Summary

Breaking change: Completely removes the camelize(str, lowFirstLetter?) function from inflekt. The case-conversion API now exposes two declarative functions with no boolean parameters:

• toCamelCase(str) — always returns camelCase
• toPascalCase(str) — always returns PascalCase

Both handle _, -, and existing camelCase/PascalCase boundaries. The old camelize implementation only split on _; the new functions use a regex (/[-_](.)/g) that also handles -.

Tests (88 passing), README, and JSDoc comments are all updated. No version bump — Dan will handle versioning when publishing.

Updates since last revision

• Deleted camelize entirely instead of deprecating it (per reviewer feedback: "DELETE THE OLD SHIT")
• Removed camelize from test imports, deleted its test suite (3 test cases removed)
• Removed deprecated camelize line from README API section
• Reverted version to 0.5.0 (no bump)

Review & Testing Checklist for Human

• Breaking change for downstream consumers: Any code importing camelize from inflekt will fail at compile time. Verify the companion PR (constructive#897) migrates all call sites before publishing.
• Verify camelize is fully removed from src/index.ts re-exports: Confirm it's not still listed in the barrel export, which would cause a build error.
• Regex behavioral difference: The old camelize used .split('_').map(...) while toPascalCase/toCamelCase use /[-_](.)/g. Inputs with double underscores (foo__bar), trailing delimiters (foo_), or other edge cases will behave differently. The audit found only clean snake_case inputs in practice — verify this holds for your codebase.

Suggested test plan: Run pnpm test in packages/inflekt, then grep across constructive for any remaining camelize imports before publishing.

Notes

• Companion PR in constructive (#897) migrates all ~30 camelize() call sites to toCamelCase/toPascalCase. That PR must land before or alongside this one.
• toScreamingSnake was added in a prior PR but is now properly documented and tested here.

Link to Devin session: https://app.devin.ai/sessions/e3dd5ed7753043bd8d2166793364cd42
Requested by: @pyramation

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