refactor: command/query separation — extract CLI wrappers, shared output helper

[carlos-alm]

Summary

• Extract 15 CLI display wrappers (~800 lines) from queries.js → queries-cli.js, reducing queries.js by 26% (3433 → 2544 lines)
• Add outputResult() helper in result-formatter.js — replaces the 4–6 line JSON/NDJSON dispatch pattern repeated in every CLI wrapper
• Extract isTestFile() into test-filter.js — breaks the circular-ish dependency where 17 modules imported it from queries.js
• Add QUERY_OPTS CLI preset — consolidates 7 repeated .option() calls across 14 commands (~98 lines removed)

Details

New files

File	Purpose
src/result-formatter.js	outputResult(data, field, opts) — returns true if JSON/NDJSON handled
src/test-filter.js	isTestFile() + TEST_PATTERN — standalone, no deps on queries.js
src/queries-cli.js	15 CLI wrappers: symbolPath, stats, queryName, impactAnalysis, moduleMap, fileDeps, fnDeps, context, children, explain, where, roles, fileExports, fnImpact, diffImpact

What stays unchanged

• All *Data() functions remain in queries.js — MCP, batch, and programmatic API untouched
• All public exports preserved via index.js re-exports — zero breaking changes
• No function renames, no signature changes

Bug fix

• cfg.js was calling printNdjson(data.results) (passing array directly) instead of printNdjson(data, 'results') — fixed via outputResult

Test plan

• 569 unit + integration tests pass (0 failures)
• biome check — 0 errors (1 pre-existing warning)
• codegraph --help — all commands listed correctly
• codegraph impact --help — shows QUERY_OPTS options

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