feat: add lipgloss-styled human output for requirement analysis commands

[yvonnedevlinrh]

Summary

The 4 requirement analysis CLI commands (requirements, triage, delta, applicability) added in #217 currently delegate their --format human output to the plain text formatter. Each command has a TODO comment noting this:

• requirements.go:202 — writeRequirementsHuman
• triage.go:183 — writeTriageHuman
• delta.go:183 — writeDeltaHuman
• applicability.go:205 — writeApplicabilityHuman

Expected Behavior

When --format human is used (the default for interactive terminals), output should use lipgloss styling consistent with the existing coverage command (cmd/complypack/cli/coverage.go), which already implements styled headers, indentation, and color.

Reference Implementation

The coverage.go command provides the canonical pattern:

• Lipgloss style definitions for headers, labels, and values
• writeHuman() function using lipgloss.NewStyle() for structured terminal output
• NO_COLOR support via resolveFormat() (already shared by all commands)

Acceptance Criteria

• complypack requirements --catalog <name> produces styled terminal output
• complypack triage --policy <name> produces styled terminal output
• complypack delta --policy <name> produces styled terminal output
• complypack applicability --catalog <name> produces styled terminal output
• Styling is consistent with coverage command output
• NO_COLOR / --format text still produces unstyled plain text
• Existing writeXxxHuman test assertions updated for styled output

Context

Part of #87. The plain text delegation was an intentional scoping decision in #217 to keep that PR focused on CLI/MCP parity (Constitution Principle III).