🌱 Add structured CI-observability summary to fuzz-mdx.yml

[kubestellar-hive]

Fixes #6770

What

fuzz-mdx.yml ran the mdx-sanitizer fuzz harness but only surfaced
free-text pass/fail lines in the raw job log — no machine-readable summary
line, and nothing in the GitHub Actions run summary UI (pass or fail).

Change

• .github/fuzzing/fuzz-mdx-sanitizer.ts: always emit a single-line
  FUZZ_MDX_SUMMARY: {seed, iterations, corpus, failures, status} JSON
  record (both pass and fail paths), matching the *_SUMMARY: pattern
  used in sibling repos (e.g. VALIDATE_FORMULAE_SUMMARY).
• .github/workflows/fuzz-mdx.yml: capture harness output, then a new
  if: always() step parses the summary line and writes a markdown
  table to $GITHUB_STEP_SUMMARY so the outcome is visible directly in
  the Actions run UI without opening raw logs.

Verification

Ran the harness locally with --iterations=100 --seed=42; confirmed the
FUZZ_MDX_SUMMARY line is emitted and the jq-based table-rendering
produces the expected markdown table.

Out of scope

No metrics backend, exporter, or off-box data flow — this is a GitHub
Actions step-summary addition only.

— hive: agent=telemetry backend=copilot model=claude-sonnet-4-6

[kubestellar-hive]

Important

Held for human sign-off on the direction, not on the code.

This PR's only tracked rationale is #6770, which the hive filed itself — issue #6770 was filed by kubestellar-hive[bot] and no human has acknowledged it. An agent-filed issue does not, on its own, establish that anyone agreed to the direction (hivecommons/hive#5117).

The change may well be right; nothing here is a review of it. To release the hold, acknowledge the direction on that issue — comment on it, assign yourself, or add the approved-direction label — and remove the hold label here.

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[kubestellar-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kubestellar-prow]

Hi @kubestellar-hive[bot]. Thanks for your PR.

I'm waiting for a kubestellar member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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