chore: expand ESLint rules for stricter code style enforcement

[weaponsforge]

Summary

• Added 6 new ESLint rules: keyword-spacing, no-multi-spaces, no-multiple-empty-lines, padding-line-between-statements, space-before-blocks, and @typescript-eslint/no-require-imports
• Changed comma-dangle from 'never' to 'always-multiline' (trailing commas required on multiline structures)
• Expanded @typescript-eslint/no-unused-vars to ignore variables/args prefixed with _; disabled the base no-unused-vars rule in favor of the TS-specific version
• Applied all new rules across 27 source files (trailing commas, blank lines before return, spacing fixes)
• Added and updated CLAUDE.md with accurate codebase documentation

Test plan

• npm run lint passes with no errors
• npm run transpile:noemit passes type-check
• npm test passes all tests

Type of Change

• Other (please describe): code styl

Checklist

• I have read the CONTRIBUTING.md
• My code follows the CODE STYLE of this project
• I have tested my changes locally

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 01179e77-96c9-4ef4-82ad-65632a3bc8f3

📥 Commits

Reviewing files that changed from the base of the PR and between 264bb01 and d5b5386.

📒 Files selected for processing (29)

• CLAUDE.md
• app/eslint.config.mjs
• app/src/__tests__/cli.test.ts
• app/src/__tests__/oauth2client.test.ts
• app/src/__tests__/sample.test.ts
• app/src/__tests__/schemavalidator.test.ts
• app/src/__tests__/send.test.ts
• app/src/__tests__/sendFormat.test.ts
• app/src/demo/sendEmail.ts
• app/src/demo/sendHtml.ts
• app/src/index.ts
• app/src/lib/email/build.ts
• app/src/lib/email/send.ts
• app/src/lib/email/sender.ts
• app/src/lib/email/transport.ts
• app/src/lib/google/oauth2client.ts
• app/src/lib/index.ts
• app/src/lib/validator/schemavalidator.ts
• app/src/scripts/build/copyTemplate.ts
• app/src/scripts/cli/lib/handleHtml.ts
• app/src/scripts/cli/lib/handleText.ts
• app/src/scripts/cli/lib/meta.ts
• app/src/scripts/cli/send.ts
• app/src/types/email.schema.ts
• app/src/types/oauth2client.interface.ts
• app/src/types/oauth2client.schema.ts
• app/src/utils/config/sanitizeHtml.ts
• app/src/utils/helpers.ts
• app/vite.config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/eslint-rules

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