fix: human-readable text output for simple commands

[margaretjgu]

Summary

Closes #379

Config commands now print human-readable text instead of raw JSON: context list prints a bullet list marking the current context, context add/edit/remove and current-context set print confirmation sentences plus warnings, and current-context get prints just the name. renderText also renders single flat objects as key: value lines, which improves extension command output for free. --json output is unchanged throughout.

Note: the bare elastic version text output originally in this PR was dropped; main now handles version text output itself.

Test plan

• npx tsc --noEmit passes
• npx tsx --test test/output.test.ts test/factory.test.ts test/cli.test.ts (344 pass)
• Manually verify elastic config context list/add, elastic config current-context get/set

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	0.74s
✅ REPOSITORY	gitleaks	yes		no	no	45.49s
✅ REPOSITORY	git_diff	yes		no	no	0.46s
✅ REPOSITORY	secretlint	yes		no	no	22.73s
✅ REPOSITORY	trivy	yes		no	no	16.35s
✅ TYPESCRIPT	eslint	5		0	0	4.07s

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