feat(phase2): llm report writer (P5.3)
- New module src/pf1e_simulator/report.py with ReportContext, build_report_context,
LLMReportPolicy, ReportBudget, format_llm_report, build_report_prompt
- Prompt pack fixture: tests/fixtures/prompt_pack_fs/report.md (FR narrator)
- CLI integration: --llm-report + --output flags, mutually exclusive with --transcript
- Budget enforcement: ReportBudget integrates with CostBudget, allows max_retries+1 calls
- Tests: test_report_context, test_report_prompt_pack, test_llm_report_policy,
test_format_llm_report, test_cli_llm_report, test_report_budget (27 new tests)
ctan
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