This directory preserves branch-specific design and source-review evidence. It is not a live task ledger or an integrated/released capability claim. All copied Markdown files retain their original bytes, source pins and historical statements; copied-evidence-sha256.json records verified copy hashes.

Input analysis candidate: 847b1caa7e75bb82f6ce5193c45bcfc45973ad1a.
Checked-source-save containment S0: 112e0d910bd2b2c9a191f29536fecb0fbc0177b0.
Private test-staged expression syntax S1: 02b9d5ce4c73d0446146b13b46a228e6fd4d7735.
Instruction/document-history merge: e8a18a7cf97a9ebf4992f00521d06792d6c012e4; implementation bytes remain those of S1.
The commit adding this directory changes only tests and evidence: it strengthens exact mixed-precedence child topology and flat Binary128/129 plus completed-deep-child failure cleanup. It does not change the S0/S1 implementation.

Preserved reports:

Revised design: root-selected syntax/oracle corrections, proposed resource calibration and implementation partitions. Resource numbers are experimental candidates, not measured adoption.
S0 independent review.
S1 independent review.
Original S0/S1 source handoff: exact scope and the original four S0/nine S1 tests. Historical .local paths and worktree statements in copied reports are provenance, not current branch status.

The added tests are language::analysis_source::tests::mixed_precedence_and_grouping_have_independent_expected_child_topology and language::analysis_source::tests::flat_binary_depth_and_malformed_constructor_retain_bounded_completed_children. There are now eleven staged syntax tests plus four source-save guard tests. The existing public checked-save regression remains unchanged and the public parser still rejects source8; its save refusal is expected until the complete adapter is implemented.

Only source inspection, rustfmt and whitespace/copy-hash checks were performed for this checkpoint. Compilation, tests, timing/RSS and native acceptance are unrun here. The independent reviews found no blocking source defect at their stated pins; they are not execution evidence. Root retains the compiler lease, final migration/version/resource adoption and integration/publication ownership. JSON/depth-switch behavior, model types, public source header admission and ordinary tokenizer implementations are unchanged.