fix(ci): count both sides of a rename in the desktop live gate, keep canary reports

[waleedlatif1]

Summary

Two CI review findings from #8748.

• desktop-live-changes.sh: git diff --name-only lists only a rename's destination, so moving a live file into a skipped path (apps/docs/, .md, ...) skipped the live desktop suite. It now diffs with --no-renames, so both the deleted source and the added destination count.
• desktop-e2e.yml: the electron@latest canary's Playwright step now sets the same BACKGROUND_EXECUTOR_REPORT_PATH / TERMINAL_CANCEL_REPORT_PATH as the pinned job, so its uploaded test-results include the JSON diagnostics.

Type of Change

• Bug fix (CI)

Testing

• New scripts/desktop-live-changes.test.ts runs the script against a temp clone with a local bare origin: rename apps/sim/x.ts -> apps/docs/x.ts gives changed=true (fails with changed=false without --no-renames), docs-only gives changed=false, an unfetchable base gives changed=true.
• bun run test:scripts: 33 files, 357 tests pass.
• actionlint clean on desktop-e2e.yml.

Checklist

• Regression test added
• No behavior change outside CI

[vercel]

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Oct 7, 2026 6:08pm UTC

[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Turn on auto-fix | Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Adjusts desktop test detection and adds test environment variables.

This PR appears safe to merge; no actionable issues were found.

What we checked:

• Renames still run desktop tests: --no-renames exposes the deleted source as well as the destination. Any path outside the skip list makes the script return changed=true.

Summary

This PR fixes two desktop CI gaps.

• desktop-live-changes.sh counts both sides of a rename, so moving a live file into a skipped path still runs the suite.
• The Electron canary sets both report paths inside its uploaded test-results folder.
• New tests cover renames, docs-only changes, and an unavailable base commit.

No actionable issues found. Tests were not run during this review.

_{Reviews (1) · Last reviewed commit: "fix(ci): count both sides of a rename in..." · Reviewed by Greptile}