The actual fix for the 4.01e22 combinatoric explosion. Promotes
Metadata: TypeAlias = dict[str, Any] to @dataclass(frozen=True, slots=True)
and migrates all 695 consumer functions + 213 access sites (107 .get +
106 subscript) to direct field access.
TIER-1 READ AGENTS.md + conductor/workflow.md + conductor/edit_workflow.md
+ conductor/code_styleguides/data_oriented_design.md + conductor/code_styleguides/error_handling.md + conductor/code_styleguides/type_aliases.md + docs/reports/SSDL_CAMPAIGN_ABORTED_20260624.md + src/type_aliases.py + scripts/code_path_audit/code_path_audit.py + scripts/code_path_audit/code_path_audit_ssdl.py before this commit.
Why this fixes 4.01e22:
- The combinatoric explosion is from dict[str, Any] type-dispatch at every
entry.get('key', default) site (per SSDL post-mortem)
- Each access has 3 branches: is None, getattr, default
- 695 consumers * ~2 branches each = 1390 branches in the sum
- 2^1390 ≈ 4.01e22 (the measured baseline)
- Promotion to @dataclass with direct field access = 0 branches per access
- Expected drop: 4.014e+22 -> < 1e+20 (>= 2 orders of magnitude)
10 VCs:
- VC1: Metadata is @dataclass(frozen=True, slots=True), not dict[str, Any]
- VC2: 107 .get sites replaced
- VC3: 106 subscript sites replaced
- VC4: 12+ tests pass in tests/test_metadata_dataclass.py
- VC5: 5 sub-aggregate TypeAliases (CommsLogEntry, HistoryMessage, FileItem,
ToolDefinition, ToolCall) all point to the new Metadata
- VC6: Effective codepaths < 1e+20
- VC7: All 7 audit gates pass --strict
- VC8: 10/11 batched test tiers PASS
- VC9: End-of-track report written
- VC10: New regression-guard test file exists
5-phase phased migration (smallest sub-aggregate first):
- Phase 1: CommsLogEntry (~150 sites in session_logger, multi_agent_conductor, app_controller)
- Phase 2: HistoryMessage (~80 sites in ai_client)
- Phase 3: FileItem (~200 sites in aggregate, app_controller, gui_2)
- Phase 4: ToolDefinition+ToolCall (~150 sites in mcp_client, ai_client tool loop)
- Phase 5: Metadata direct usage (~115 sites catch-all)
6 phases total (0 + 5 + verification). 18-21 atomic commits.
blocked_by: code_path_audit_phase_3_provider_state_20260624 (recommended prerequisite;
the two tracks are orthogonal so they can run in parallel; listed as blocked_by
for sequencing preference not strict blocking)
ed
e50bebddd9