fix(archive): accept 'forever' as a valid --until value

[BYK]

Summary

Fixes CLI-1MD: users passing --until forever to sentry issue archive received a ValidationError. Since omitting --until already archives forever, forever is a natural and discoverable alias.

Changes

• Adds { kind: "forever" } to the UntilSpec union
• Recognizes "forever" (case-insensitive) in parseUntilSpec
• Maps { kind: "forever" } to { substatus: "archived_forever" } in specToApiOptions — identical to the no---until path
• Adds forever to the --until flag brief and the unrecognized-value error hint
• Adds 3 tests: parseUntilSpec("forever"), parseUntilSpec("Forever") (case-insensitive), and a func() integration test

Before / After

# Before
$ sentry issue archive CLI-1MD --until forever
ValidationError: invalid --until value: 'forever'

# After
$ sentry issue archive CLI-1MD --until forever
# Archives forever — same as omitting --until

[github-actions]

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[github-actions]

Codecov Results 📊

✅ 6681 passed | Total: 6681 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +3
Passed Tests	📈 +3
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

❌ Patch coverage is 77.78%. Project has 13823 uncovered lines.
❌ Project coverage is 76.28%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
src/commands/issue/archive.ts	77.78%	⚠️ 2 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
- Coverage    76.69%    76.28%    -0.41%
==========================================
  Files          303       303         —
  Lines        57961     58282      +321
  Branches         0         0         —
==========================================
+ Hits         44453     44459        +6
- Misses       13508     13823      +315
- Partials         0         0         —

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