…ns (#32)

`CI / required` is the last red check on `main`. After #31 fixed the
version
assert, the job got two steps further and now fails at **Validate
repository
contracts** with exit code 2 and one line of output:

```
jq is required
```

## Root cause

`tests/check-examples.sh:15`:

```bash
command -v jq >/dev/null || { echo "jq is required"; exit 2; }
```

The pinned `idris2-pack` image does not ship `jq`. So the **Trope IR
conformance
test — the one asserting every example lowers to valid Trope IR — has
never
actually executed in CI.** It bailed before testing anything.

That makes this more than a build fix: it turns a step that always died
early
into one that genuinely exercises the language's core guarantee.

## Fix

Same class of problem as the missing `xz` in #28, so the step now
handles both:
collect what is absent, install in a single `apt-get` pass, print both
versions
so the log records what ran. A no-op on images that already have them.

## Verified locally against `origin/main` (d29f89e)

```
bash -n over tests/ scripts/ ............... all parse
tests/check-examples.sh .................... exit 0  → "examples: all lower to valid Trope IR"
tests/aspect_tests.sh ...................... exit 0  → PASS=3 FAIL=0 WARN=0
scripts/check-root-shape.sh ................ exit 0  → 45 entries, 46 permitted
tests/workflows/validate_workflows_test.sh . exit 0  → Workflow validation PASSED
```

Note `check-examples.sh` skips the verdict round-trip when no sibling
`tropecheck` binary is built — that part still needs `trope-checker`,
and is
reported as a `note`, not a pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>