fix(experiments): repair dead qualitative-feedback links in experiment skills - #91281

Problem

• A reader following the qualitative-feedback handoff cannot open the promised file. The optional survey handoff is a dead end.
• The link reads references/qualitative-feedback.md, which resolves relative to the skill doing the pointing — and none of those skills has a references/ directory.
• The file exists, but under a sibling skill: diagnosing-experiment-results/references/qualitative-feedback.md.
• Three skills carry the handoff, so a reader hits the same dead path from any of them.

Changes

• Each handoff now points at a resolvable relative link, so the reader opens the file instead of hitting a dead path.
• Mechanical: one line each in analyzing-experiment-session-replays, scanning-experiments-with-replay-vision, and managing-experiment-lifecycle; the [[diagnosing-experiment-results]] wiki-link stays for skill discovery.

How did you test this code?

• Confirmed ../diagnosing-experiment-results/references/qualitative-feedback.md resolves to an existing file from each of the three skill directories.
• Swept every skill in the repo for path references that do not resolve, to confirm no fourth occurrence of this handoff was missed.
• No automated tests apply to a documentation link.

Automatic notifications

• Publish to changelog?

Docs update

None.

🤖 Agent context

Autonomy: Fully autonomous

• An earlier revision fixed only the reported skill and left the two siblings. They carried the identical dead path, so they are fixed here too rather than left for a follow-up.
• The relative-link shape matches existing cross-skill references elsewhere in the repo, so this follows the established convention rather than introducing one.
• The sweep also surfaced many cross-skill mentions written as prose that names the owning skill (`authoring-scouts` → `references/report-contract.md`). Those are a deliberate convention, not the same defect, and were left alone.
• The handoff content is useful, so the fix repairs the link rather than removing the section.

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