reshape: four path constructions that named src/ from pieces; a JDK-layout fixture path wrongly rewritten; drop test/java/README.md and the TypeScript results snapshot

check_staging.py, check_arity.py, literal_gate.py and empty_relation_lint.py built the
engine path from ('src', lang) and were missed by the rewrite; they point at graph/ now.
jdk-ir-stamp-test.sh's fixture mimics the JDK source layout (src/java.base/share/classes)
and had been rewritten as if src/java were the engine — reverted. The Java suite README
is removed (its run instructions move to the root README's Tests section) and so is
graph/typescript/RESULTS.md, a measurement snapshot naming the corpus projects that
nothing referenced.

Author: swapnilpaliwal-sd

README.md

@@ -213,6 +213,21 @@ skills/code-graph/                how an agent builds and queries the graph
 test/<lang>/                      regression suites, torture harnesses, oracles
 ```
 
+## Tests
+
+```bash
+bash test/java/run-tests.sh          # regression suite; --oracle also scores against javac/javap ground truth
+bash test/typescript/run-tests.sh    # --oracle scores against the TypeScript compiler
+bash test/python/run-tests.sh        # --oracle scores against CPython bytecode and tracing
+npm test -w parser                   # the parser's own suite
+```
+
+Each suite parses its fixture cases with the parser in this repository (`AXIOM_PARSER` overrides),
+solves them, guards that no call site was dropped, and diffs the normalised edges against a
+golden. `--keep` retains the per-case work directories (`test/<lang>/.work/<case>/out/graph.sqlite`
+is a real bundle to poke at); `--bless` regenerates goldens — review the diff. The torture
+harnesses (`test/<lang>/torture/`) and the TypeScript corpus runner score real projects.
+
 ## Known limits
 
 Stated because a graph you can't trust the boundaries of isn't useful: