perf(init): run org detection in background during preamble

[MathurAditya724]

Summary

• Starts DSN scanning (resolveOrg) and org-list fetching (listOrganizations) concurrently with the sentry init preamble phase (experimental confirm + git status check), so results are ready when the wizard later needs the org for project creation.
• On a cold start (no DSN cache), this eliminates 2-5 seconds of blocking latency that previously occurred deep inside the wizard's suspend/resume loop at createSentryProject → resolveOrgSlug.
• When the org is already explicit (e.g., sentry init acme/my-app), background detection is skipped entirely.

How it works

Before:
  init → preamble (user confirms) → wizard starts → ... → create-sentry-project
    → resolveOrgSlug → resolveOrg (DSN scan, 2-5s) → listOrganizations (300ms)

After:
  init → [bg: resolveOrg + listOrganizations] → preamble (user confirms) → wizard starts → ...
    → create-sentry-project → resolveOrgSlug → await bg results (already settled, ~0ms)

Changes

File	Change
src/lib/init/types.ts	New BgOrgDetection type with pre-started promise fields
src/commands/init.ts	Fire background detection before runWizard() when org is unknown
src/lib/init/local-ops.ts	resolveOrgSlug() accepts optional BgOrgDetection to use pre-fetched results
test/commands/init.test.ts	7 new tests verifying background detection is passed/omitted correctly

Risk

Low. Background promises are .catch()-wrapped — if they fail, the existing synchronous path runs as a fallback. No behavioral change for the user; only latency improvement.

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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Internal Changes 🔧

• (init) Run org detection in background during preamble by MathurAditya724 in #443

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[github-actions]

Codecov Results 📊

✅ 111 passed | Total: 111 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	—
Failed Tests	—
Skipped Tests	—

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 1101 uncovered lines.
✅ Project coverage is 95.09%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    95.09%    95.09%        —%
==========================================
  Files          165       166        +1
  Lines        22424     22444       +20
  Branches         0         0         —
==========================================
+ Hits         21324     21343       +19
- Misses        1100      1101        +1
- Partials         0         0         —

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