docs(traces): record proxy diagnosis and repair aggregate admission

Preserve both failed C1 source cohorts and the controlled D1 result without
claiming historical Interrupted, interleaving, or C2 database causation.
Activate the reviewed two-defect repair boundary with MTR-104 as its sole
versioned publisher, and synchronize the current cross-repository indexes.

DIAG-MTR-01 local evidence handoff only. The four implementation candidates
remain unstaged. Combined AF1, each child's incremental review and precise
commit, and MTR-104 full final C/D are still required. No version bump,
branch/tag push or Release belongs to this document commit.

Final local Claude document ER05/H0 PASS: a3f7bd2d-521b-4900-9b1f-9c6cbe0d72ad.
Final review output SHA256: a875a4c9576584b98e789c40ff7b9010236d76ce6c20bb6c60d68900c8e3da5c.

Signed-off-by: ELi Ma <eli@patch.sh>

Author: genedna