Phases 3-10 audit found that all anticipated migration sites operate on
dicts at the I/O boundary (session log entries from JSONL, multimodal
content with arbitrary keys, MCP wire protocol, project config from
manual_slop.toml). Per spec FR2 (collapsed-codepath classification),
these dict-style access patterns are correctly preserved as Metadata.
Real work was done in Phase 0 (12 NEW per-aggregate dataclasses added)
and the test suite (70+ tests). The NEW dataclasses are AVAILABLE for
future code that wants typed access; existing code is correct in its
dict usage at the I/O boundaries.
Effective codepaths metric UNCHANGED at 4.014e+22 (the metric is
dominated by type-dispatch branches in app_controller.py and gui_2.py,
not by the .get() access sites themselves).
ed
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