Add capture command (snapshot live company-file data as JSON)

[Benjvandam]

Stage 2 of the live-bridge initiative. Stacked on #258 (base add-get-results-command); will retarget to main once #258 merges.

What

New capture -u <url> [--full] [-o <file>] snapshots a live company file as JSON.

• Default (scoped): reuses the create-test gathering to capture the template at the URL and its dependencies.
• --full: fans out company + every period + every workflow reconciliation (customs + results), serialized per company (the API allows 1 in-flight call per company).

How

• lib/dataCapture.js (capture/captureScoped/captureFull).
• Refactored lib/liquidTestGenerator.js to expose buildLiquidTest() (returns the object); testGenerator() now calls it then exportYAML — create-test behaviour unchanged.
• Thin command in bin/cli.js; JSON to stdout or --output.

Tests

• tests/lib/dataCapture.test.js (scoped + full); existing liquidTestGenerator test still green after the refactor. Full suite green (565 tests); eslint clean.

Note

Account-level customs are captured in scoped mode but not in --full (no list-accounts endpoint wired in the CLI). Read-only command (no writes).

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✨ Finishing Touches

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[Benjvandam]

Consolidated into #260 (one PR for all four live-bridge commands). Closing.