fix(factory): route stderr writes through configureOutput

[margaretjgu]

Relates to #455.

Migrates the error-path writes in factory.ts's action handler from process.stderr.write to cmd.configureOutput().writeErr, the channel cmd.error() and existing tests already use. Left stdout writes alone: configureHelpWithSchema already claims writeOut on every command for --help output, so routing regular handler output through it would silently change write semantics. Confirmed by migrating it first and watching status/sanitize/scroll-search tests break, then reverting that part.

Also bumps fast-uri 3.1.4 to 3.1.5 to clear a Trivy-flagged CVE that was failing CI, unrelated to the factory.ts change.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	1.03s
✅ REPOSITORY	gitleaks	yes		no	no	56.91s
✅ REPOSITORY	git_diff	yes		no	no	0.7s
✅ REPOSITORY	secretlint	yes		no	no	29.05s
✅ REPOSITORY	trivy	yes		no	no	17.87s
✅ TYPESCRIPT	eslint	1		0	0	3.77s

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