feat: unify casing libraries — komoji as origin of truth

[pyramation]

Summary

Makes komoji the single origin for all pure case transformations and has inflekt delegate to it, eliminating duplicate implementations.

komoji changes:

• Bugfix: toPascalCase now handles consecutive separators correctly ("my__double_under" → "MyDoubleUnder" instead of "MydoubleUnder")
• New exports: lcFirst and ucFirst (moved from inflekt)
• New tests for the bug fix, new functions, and edge cases (spaces, leading separators, consecutive mixed separators)

inflekt changes:

• lcFirst, ucFirst, toPascalCase, toCamelCase now delegate to komoji
• toSnakeCase and toConstantCase are re-exported directly from komoji (new exports — lets consumers adopt the preferred names without adding komoji as a direct dependency)
• underscore delegates to komoji's toSnakeCase (marked @deprecated)
• toScreamingSnake delegates to komoji's toConstantCase (marked @deprecated)
• fixCapitalisedPlural remains in inflekt (inflekt-specific)
• Added komoji as a workspace dependency

All 60 komoji tests and 88 inflekt tests pass.

Review & Testing Checklist for Human

• Acronym handling change in underscore / toScreamingSnake: The old inflekt underscore split every uppercase letter individually ("APIKey" → "a_p_i_key"). Komoji's toSnakeCase groups acronyms ("APIKey" → "api_key"). This is arguably better but is a silent behavioral change for downstream callers passing acronym-heavy strings. Grep for underscore( and toScreamingSnake( usage across all consumers and verify the new acronym behavior is acceptable.
• toCamelCase now handles spaces: Old inflekt only handled - and _ delimiters. Komoji also handles spaces and consecutive separators. Verify no downstream code relies on spaces being preserved.
• toPascalCase broadened scope: Same as above — now handles spaces and consecutive separators. Verify downstream behavior.
• Confirm workspace:* resolves correctly at publish time: When inflekt is published to npm, komoji must be published first (or simultaneously) so the workspace protocol resolves to a real version.

Recommended test plan: Run the constructive monorepo's full test suite (especially graphql/codegen, graphql/query, pgpm/export) with these updated packages to verify no downstream breakage from the behavioral differences listed above.

Notes

• The pnpm-lock.yaml diff is large but is almost entirely formatting changes (single quotes vs double quotes from pnpm version). The only meaningful change is the addition of the komoji workspace dependency for inflekt.
• A companion PR for constructive-io/constructive (#913) migrates toScreamingSnake → toConstantCase and underscore → toSnakeCase imports in consumer code.

Link to Devin session: https://app.devin.ai/sessions/c92c3a11450342f8875625a60fa1be28
Requested by: @pyramation

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