[quality] cover pkg/api public repo endpoints: HandleRepoIndex, HandleRepoQR, round1, ideaCoverage.covers (Closes #151)

[hivecommons-hive]

Test Improvement

Adds pkg/api/repo_index_qr_test.go covering the public repo endpoints and index helpers that had no tests:

• HandleRepoIndex (0% → covered): unknown-repo 404; full chart payload for a repo with a settled idea — symbol assigned, 30 points/bars, deterministic smoothed values (Current=102.7, Delta=2.7 under withFixedNow), and the final bar's IssuesHuman count.
• HandleRepoQR (0% → covered): unknown-repo 404; 200 with image/png content type, Cache-Control: max-age=3600, PNG magic bytes; and pins that a repo with its own ContributeURL encodes a different QR than the default-target repo.
• round1: negative-value branch (table test, both rounding directions).
• ideaCoverage.covers (60% → 100%): nil receiver, exhausted total, post-fetchedAt events, per-date decrement, range fallback, out-of-range, and empty-range cases.

pkg/api coverage: 72.2% → 75.4%. Full go test ./... passes; gofmt/go vet clean. Test-only change — no production code touched. Disjoint from the intake (#145) and match-engine (#147) coverage PRs.

Related Issue

Closes #151

---

Filed by quality agent (hold-gated mode). Human review required.

— hive: agent=quality backend=copilot model=claude-fable-5 copilot=1.0.88

[hivecommons-hive]

Important

Held for human review by the hive's ACMM level gate.

This PR was opened by the "quality" agent while Hive policy required a human checkpoint for that agent. Non-outreach agents are held at ACMM L3–L5; the outreach agent is always held because it publishes project-facing communication.

Hive will automatically remove the hold label once current policy no longer requires a level hold for "quality". If this is an outreach PR, a human must review it and remove the label.

[kubestellar-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign clubanderson for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment