feat(audit): implement Phase 8 v2 DSL + Phase 9 run_audit + CLI + MCP
Phase 8: to_dsl_v2 (flat-section writer, 14 sections),
to_markdown (10 sections), to_tree (box-drawing prefix tree),
parse_dsl_v2 (round-trip parser).
Phase 9: AGGREGATES_IN_SCOPE (10) + CANDIDATE_AGGREGATES (3),
synthesize_aggregate_profile (per-aggregate builder, candidate
placeholder path), AuditSummary dataclass, run_audit() main
entry, render_rollups() (4 top-level files: summary,
cross_audit_summary, decomposition_matrix, candidates),
code_path_audit_v2() MCP tool wrapper.
13 new unit tests passing. 124 total tests passing.
Phase 10 (integration tests with synthetic src/) next - may be
deferred to next session if context runs low.
ed
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