feat: add tradingview-cli for composable CLI usage

[bearmug]

Summary

• Add tradingview-cli binary alongside existing MCP server — same npm package, dual mode
• Inspired by mariozechner's post on CLI tools being simpler, more composable, and more token-efficient than MCP servers
• Zero new runtime dependencies — uses Node 18+ built-in util.parseArgs
• 70 new CLI tests (unit + end-to-end) on top of existing 94

CLI Commands

tradingview-cli screen stocks --preset quality_stocks --limit 10
tradingview-cli screen stocks --filters '[{"field":"RSI","operator":"in_range","value":[40,60]}]'
tradingview-cli lookup NASDAQ:AAPL TVC:SPX
tradingview-cli fields --asset-type stock --category fundamental
tradingview-cli presets

Output Formats

JSON (default, pipeable to jq), CSV (-f csv), table (-f table)

Architecture

• src/cli.ts — entry point with dispatch
• src/cli/parseArgs.ts — argument parsing, preset merging
• src/cli/formatters.ts — JSON/CSV/table output
• src/cli/help.ts — help text
• All existing MCP code is untouched

Test plan

• npm run build compiles clean
• npm test — 164 tests pass (94 existing + 70 new CLI tests)
• E2E tests: --help, --version, presets, fields, preset, screen help
• E2E error tests: unknown command, invalid asset type, missing symbols, unknown preset
• Smoke test: CSV, table, JSON output formats
• Verify MCP mode unaffected (no changes to src/index.ts or existing files)