The queryProjectionIsGood function in rules-sparql-1-2/validators.ts is a
separate implementation from the 1.1 version (changed per w3c/sparql-query#380).
Although all 1.1 tests correctly run against the 1.2 parser, several branches
of this function were not reached by any existing test.

Fix by adding cases to the shared test infrastructure so they run on
both parsers automatically:

- 3 new sparql-1-1-invalid static queries (select-star-with-group-by,
  ungrouped-variable-in-expression-projection,
  count-with-ungrouped-expression-variable) that cover the throw paths
  in queryProjectionIsGood (lines 123 and 158).

- 3 new note tests in importSparql11NoteTests covering the no-throw
  branches: AS variable not conflicting with a term-var subquery,
  AS variable not conflicting with a wildcard subquery, and expression
  projection variable covered by GROUP BY (line 158 and 183-186 FALSE
  branches).

Also add rapport.md documenting the investigation findings.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Replace the three programmatic 'should NOT throw' tests added in the
previous commit with proper static test files that slot into the shared
positive-test infrastructure and therefore run automatically on all
parsers (1.1, 1.1-adjust, 1.2) and the 1.2 generator.

Files added per test case:
- sparql/sparql-1-1/<name>.sparql        – the query under test
- ast-source-tracked/sparql-1-1/<name>.json – expected AST (source-tracked)
- sparql-generated/sparql-1-1/<name>.sparql – expected generator output
- sparql-generated-compact/sparql-1-1/<name>.sparql – compact generator output

Cases migrated:
- note-as-var-not-in-term-subquery
- note-as-var-not-in-wildcard-subquery
- note-expression-grouped-var

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>