Fix verbose progress leaking into redirected stdout

[karamouche]

Summary

• Send -v progress/spinner messages to stderr instead of stdout
• Keeps redirected output (> output.json) as clean JSON only

Test plan

• gladia transcribe <url> -o json -v > output.json — file is valid JSON, progress still shows in the terminal
• go test ./pkg/client/ -run TestPollForTranscriptionResult_verboseGoesToStderr

Summary by CodeRabbit

• Bug Fixes
  • Verbose transcription progress, completion, and error messages are now sent to the error output stream instead of standard output.
  • Prevents status messages from interfering with normal command output.

[coderabbitai]

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c467be82-6422-4258-98d2-4eb4e36dfcf3

📥 Commits

Reviewing files that changed from the base of the PR and between 620e728 and fb955b9.

📒 Files selected for processing (2)

• pkg/client/transcribe.go
• pkg/client/transcribe_test.go

⏰ Context from checks skipped due to timeout. (2)

• GitHub Check: Analyze (go)
• GitHub Check: Analyze (actions)

🧰 Additional context used

🪛 golangci-lint (2.12.2)

pkg/client/transcribe_test.go

[error] 176-176: Error return value of stdoutW.Close is not checked

(errcheck)

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[error] 177-177: Error return value of stderrW.Close is not checked

(errcheck)

📝 Walkthrough

Walkthrough

Verbose transcription progress, completion, and error messages are redirected from stdout to stderr. A new test verifies stderr output during a processing-to-completed polling sequence and confirms stdout remains empty.

Changes

Transcription output routing

Layer / File(s)	Summary
Route verbose output to stderr pkg/client/transcribe.go, pkg/client/transcribe_test.go	Verbose polling messages use os.Stderr, and a new test validates progress and completion output while confirming stdout is empty.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• gladiaio/gladia-cli#22: Both changes touch pollForTranscriptionResult in pkg/client/transcribe.go.

Suggested reviewers: jqueguiner

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: verbose progress output was moved off redirected stdout.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/verbose-polluting-output

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