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+# Progress (for a new Claude session)
+
+Reading order: `CLAUDE.md` -> this file -> `tests/DESIGN-forest-from-spans.md` (the plan).
+Reference cases: `forest-examples.md`.  Older notes, only if something points there:
+`tests/CLAUDE-PROGRESS-ARCHIVE.md`.
+
+## Rules that matter
+- The user writes ALL source by hand.  Claude plans, explains, and writes files ONLY in `tests/`
+  and in the scratch workspace.  No diffs unless asked.
+- Do not weaken reference cases or tests.  Minimal targeted changes.  Every fixed bug gets a
+  regression test that failed before the fix.  Label claims MEASURED / INFERRED / guess.
+- Do not open the paper PDFs without asking; the forest construction is the user's own design.
+- macOS: BSD sed, so edit files with python.  Paths contain spaces: quote them.
+- zsh: `env $v cmd` with `v="A=1 B=1"` sets only `A`; write switches literally.
+
+## Scratch workspace
+`<repo>` = `/Users/durand/Desktop/Centre/A propos de programmes/Rust/rep`.
+`<repo>/claude scratch/ws` (full copy), build dir `<repo>/claude scratch/target`.  Run:
+`cd "<repo>/claude scratch/ws" && CARGO_TARGET_DIR="<repo>/claude scratch/target" cargo test --test oracle -- --test-threads=1`
+Prototypes and their switches: design doc section 9.
+
+## Current state
+- **Design settled and verified in scratch** (design doc section 7).  What remains is to follow
+  the plan in design doc section 5: Part A (recognizer fixes, section 3), then Part B (forest
+  from facts, section 4).  No research is left.
+- **The user's tree has none of the fixes yet.**  They exist only in scratch, behind switches.
+- **Tests** (design doc section 6): four open recognition tests fail today and pass with the
+  fixes; one guard test passes and must keep passing.
+- **Suite today (scratch, default, probes skipped):** 36 passed, 13 failed (the 4 open
+  recognition tests and 9 old forest tests), 1 ignored.  The 9 forest tests are expected to pass
+  after plan step 11: the top-down prototype gives exactly the oracle's trees on all of them.
+- **Next:** the user implements the plan, Part A first.