fix(api): auto-correct ':' to '=' in --field values with a warning

[BYK]

Problem

Two production errors (CLI-9H, CLI-93) share the same root cause: users pass --field values using : as the separator instead of =, matching Sentry search-query syntax instincts.

• sentry api .../issues/ -X PUT -F project:4510942921490432 -F status:resolved
• sentry api .../issues/.../stats/ -F since:2026-02-25T11:20:00

Both crashed immediately with Invalid field format: … Expected key=value — correct but unhelpful, and a hard failure either way.

Solution

Auto-correct and warn instead of crash, following the established pattern for recoverable user mistakes.

• Added normalizeFields(fields, stderr) that rewrites key:value → key=value and prints a warning to stderr when a field has no =. Splitting on the first : preserves colons inside values (ISO timestamps, URLs with ports).
• Correction only fires when there is no = at all — the request would crash anyway, so there is no ambiguity.
• Parsers stay pure; normalization happens at the command level in func() before prepareRequestOptions(), covering both body and query-param paths.
• Upgraded bare throw new Error sites in the field parsers to throw new ValidationError for clean central error handling.

Testing

11 new unit tests for normalizeFields (pass-through, colon-correction, timestamp/URL values, mixed fields, edge cases). 3 existing error tests updated to assert ValidationError type. Full suite: 2082 pass, 0 fail.

Fixes CLI-9H
Fixes CLI-93

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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Bug Fixes 🐛

• (api) Auto-correct ':' to '=' in --field values with a warning by BYK in #302

• (ci) Generate JUnit XML to silence codecov-action warnings by BYK in #300
• (nightly) Push to GHCR from artifacts dir so layer titles are bare filenames by BYK in #301

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[github-actions]

Codecov Results 📊

✅ 2082 passed | Total: 2082 | Pass Rate: 100% | Execution Time: 0ms

All tests are passing successfully.

✅ Patch coverage is 85.42%. Project has 3608 uncovered lines.
✅ Project coverage is 76.47%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
api.ts	90.36%	⚠️ 48 Missing

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    76.42%    76.47%    +0.05%
==========================================
  Files          117       117         —
  Lines        15298     15335       +37
  Branches         0         0         —
==========================================
+ Hits         11691     11727       +36
- Misses        3607      3608        +1
- Partials         0         0         —

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