fix: replace raw echo with output helpers in general/stream

[github-actions]

Summary

• Replace the local die() function in general/stream with the standard output helpers (die, success, info) matching the project's shell-script conventions
• The previous die() used bare echo calls; the new implementation uses printf with ANSI colour codes and writes to stderr
• Trailing whitespace also removed by pre-commit hook

Closes #638

Test plan

• shellcheck passes (verified via pre-commit hook)
• Script behaviour preserved — die still exits non-zero with the streamer-not-specified message

[dnyw4l3n13]

PR review complete. All checks passed and the implementation is correct:

• die, success, and info helpers in general/stream match the reference implementations in shell-scripts.examples.md exactly
• die correctly writes to stderr (>&2) and exits non-zero
• Trailing whitespace removed from do line
• CHANGELOG.md updated under the Unreleased section
• All CI checks pass (build-pre-release, pull-request, Apply Template, Update Change Type Checkboxes)

No outstanding work — PR is ready for merge.

[credfeto]

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[dnyw4l3n13]

All CI checks pass and the PR has been approved. No outstanding work — the implementation is complete and ready for merge.

[dnyw4l3n13]

Status report: All work on this PR is complete.

• All CI checks pass (bash linting, changelog, build, no secrets, no merge conflicts, etc.)
• PR approved by @credfeto
• No outstanding review comments or actions needed
• PR is ready for merge

[credfeto]

Super-linter summary

Language	Validation result
BASH	Pass ✅

All files and directories linted successfully

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[dnyw4l3n13]

Status report: All work on this PR is complete.

• All CI checks pass (bash linting, changelog, build, no secrets, no merge conflicts, etc.)
• PR approved by @credfeto
• PR is not in draft — ready for merge
• No outstanding review comments or actions needed