fix(issue): accept 1 positional + --into as valid merge (CLI-1AE)

[BYK]

Summary

• Fixes CLI-1AE: sentry issue merge A --into B raised a spurious ValidationError: needs at least 2 issue IDs (got 1) even though two distinct issues were provided
• When exactly 1 positional arg is given alongside --into, the --into value is now treated as the second issue in the merge set
• Improves the 1-positional-no---into error hint to show the --into form as an alternative

Root Cause

The arity check in func() counted only positional args (args.length < 2). When a user ran:

sentry issue merge THEARTHIQDAILY-PROD-D --into THEARTHIQDAILY-PROD-C

args = ["THEARTHIQDAILY-PROD-D"] and flags.into = "THEARTHIQDAILY-PROD-C", so args.length === 1 triggered the error despite two distinct issues being specified.

Fix

Before validation, build effectiveArgs: if args.length === 1 and --into is set, append the --into value. The rest of the pipeline is unchanged — resolveAllIssues resolves all entries in parallel, orderForMerge still places the --into target at the front, and the existing dedupe check handles merge A --into A.

Tests

7 new test cases added to test/commands/issue/merge.func.test.ts:

1. 0 positionals, no --into → arity error (existing test split/clarified)
2. 1 positional, no --into → arity error with --into hint
3. 0 positionals + --into → still arity error (effectiveArgs.length = 1)
4. 1 positional + --into → valid merge, --into target becomes preferred parent (the fix)
5. 1 positional + --into same issue → dedupe guard ("at least 2 distinct issues")

[github-actions]

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Codecov Results 📊

✅ 6686 passed | Total: 6686 | Pass Rate: 100% | Execution Time: 0ms

📊 Comparison with Base Branch

Metric	Change
Total Tests	📈 +4
Passed Tests	📈 +4
Failed Tests	—
Skipped Tests	—

All tests are passing successfully.

❌ Patch coverage is 64.29%. Project has 13518 uncovered lines.
✅ Project coverage is 76.68%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
src/commands/issue/merge.ts	64.29%	⚠️ 5 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    76.67%    76.68%    +0.01%
==========================================
  Files          303       303         —
  Lines        57977     57979        +2
  Branches         0         0         —
==========================================
+ Hits         44454     44461        +7
- Misses       13523     13518        -5
- Partials         0         0         —

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