fix(init): force process exit after wizard completes

[betegon]

Summary

• sentry init hangs after the wizard finishes, requiring Ctrl+C (or, with the partial fix from this branch's earlier iteration, one Enter) to recover the shell prompt
• Root cause: Bun's global fetch dispatcher (used by MastraClient) holds keep-alive sockets open after requests return, keeping the libuv loop alive past the wizard. There's no clean programmatic close for it.
• Fix: explicit `process.exit(process.exitCode ?? 0)` at the end of `init` command's `func`. `init` is a terminal command, `process.exit` flushes stdio before exiting, and the OS releases the lingering handles unconditionally.

Fixes #780.

Test plan

• `cat /tmp/install-local | SENTRY_INIT=1 bash` (curl|bash repro) — shell prompt returns immediately, no Enter or Ctrl+C
• Wizard cancel path (Ctrl-C at confirm prompt) — exits cleanly
• `bun run lint` — clean (only pre-existing warning in markdown.ts)
• `bun run typecheck` — passes

🤖 Generated with Claude Code

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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New Features ✨

• (issue) Add resolve, unresolve (reopen), and merge commands by BYK in #778

Bug Fixes 🐛

• (error-reporting) Fall back to message prefix for ValidationError without field by BYK in #776
• (hex-id) Auto-recover malformed hex IDs in view commands (CLI-16G) by BYK in #777

• (init) Force process exit after wizard completes by betegon in #782

Internal Changes 🔧

• (init) Trim deprecated --features help entries by MathurAditya724 in #781
• Regenerate docs by github-actions[bot] in 58a84035

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Codecov Results 📊

✅ 138 passed | Total: 138 | 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 1705 uncovered lines.
✅ Project coverage is 95.53%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
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+ Coverage    95.50%    95.53%    +0.03%
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  Files          262       262         —
  Lines        38170     38173        +3
  Branches         0         0         —
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+ Hits         36454     36468       +14
- Misses        1716      1705       -11
- Partials         0         0         —

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