feat: add bootcamp styles command to list built-in style packs

[Arthur742Ramos]

Summary

Adds a bootcamp styles command (alias style) that lists the built-in style packs and the documentation sections each one enables.

Style packs (corporate, startup, oss, academic, minimal) control which docs a run emits — Runbook, Security, Dependencies, Radar, Impact, Metrics, Health — plus tone, section depth, emoji usage, and starter-task count. Until now the only way to discover what each --style actually does was to read src/plugins.ts. This makes the packs first-class and discoverable from the CLI.

What it does

• Human report — a per-pack summary (description, tone, depth, emoji, first-task count, enabled sections) followed by a section-coverage matrix, with the default pack (oss) clearly flagged.
• --json — a stable, machine-readable payload (default pack, count, and the full config surface per style) for scripting.
• Alias — reachable as bootcamp style too.

Example:

$ bootcamp styles
Built-in style packs
Use with: bootcamp <repo-url> --style <name>   (default: oss)

  corporate
    Structured, policy-aligned onboarding documentation
    tone: formal   depth: deep   emoji: no   first tasks: 10
    sections: Runbook, Security, Deps, Radar, Impact, Metrics, Health
  ...
Section coverage

STYLE      Runbook  Security  Deps  Radar  Impact  Metrics  Health
corporate     ✓        ✓       ✓      ✓      ✓        ✓       ✓
startup       ✓        ·       ·      ✓      ·        ✓       ✓
oss           ·        ✓       ✓      ✓      ·        ✓       ✓
academic      ·        ✓       ✓      ·      ✓        ✓       ✓
minimal       ·        ·       ·      ·      ·        ·       ·

Implementation notes

• The renderer reads the existing STYLE_PACKS registry directly, so the output can never drift from the packs themselves — adding/changing a pack automatically updates this command.
• All formatting helpers (buildStylesJson, buildHumanOutput, renderSectionMatrix, enabledSectionLabels) are pure and exported, following the same DI/testability pattern as cache list and doctor.
• Column alignment is computed on plain text with color applied last, so ANSI codes never break the matrix.

Testing

• 16 unit tests (test/styles-command.test.ts) pinning the JSON payload, matrix, and human report.
• 3 E2E tests (test/e2e/styles-command.e2e.test.ts) spawning the real CLI for the human report, --json, and the style alias.
• Full suite green: npm test → 1078 passing; typecheck + lint clean; build passes.

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