test runner reports false green for missing and failing suites

[hyperpolymath]

The root just test aggregate currently converts every missing directory, missing tool, configuration error, compile failure, and failing test into exit 0 via || echo SKIP.

Observed causes:

• the Groove target was extracted by chore: extract groove-protocol/ to top-level hyperpolymath/groove-protocol #228 but remains in the runner
• Deno task configuration was deliberately removed by refactor: eradicate TypeScript and NPM/Deno configs #612, while the runner still invokes deno task test
• real Cargo/Deno failures are mislabeled as unavailable tools
• the offline repo-guardian Rust suite is omitted
• AXEL AffineScript tests do not yet have an executable harness and should be tracked as debt, not counted as skipped/passing

Required repair:

• run the four currently executable suites directly
• fail distinctly for missing target and missing executable
• preserve the real test process exit code
• add behavioral regression coverage proving the failure modes do not become SKIP
• refresh TEST-NEEDS and the MCP scorecard

Adjacent debt, intentionally out of the first patch: build, fmt, and lint contain similar failure-swallowing recipes; build and clean retain extracted Groove paths.

Observation horizon: the tracked standards tree/history, PRs #228 and #612, and direct execution of the four currently runnable suites. This is not an estate-wide test inventory.