M1: Update quickstart docs with comment help → MAML usage

[jeffpatton1971]

Document the milestone’s delivered workflow in docs/usage/quickstart.md (and/or root README if that’s your convention).

Definition of done

• Shows command invocation
• Shows output folder layout
• Notes current limitations (MAML only; no HelpInfo yet)

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Suggested label taxonomy mapping

If your existing labels are slightly different, here’s the intended mapping:

• adr:001 → whatever you use to tag ADR-001 scoped work (e.g., ADR-001)
• milestone:m1 → your milestone label (or skip if milestones handle it)
• area:core, area:powershell, area:tests, area:docs
• type:feature, type:test, type:docs, type:chore

This keeps filtering dead simple:

• “Show me everything for ADR-001”
• “Show me everything in Core”
• “Show me tests left for M1”