fix(cli): show banner on --help to match bare elastic output

[l-trotta]

Summary

Bare elastic printed the ascii banner before the usage; elastic --help printed only the usage. They now produce identical output.

The banner-rendering branch was inlined inside the no-args fallback in src/cli.ts, so it never ran on Commander's --help path. Moved it into a program.addHelpText('before', ...) hook on the root command so both invocations go through the same code, and dropped the duplicated banner write in the no-args branch.

'before' (not 'beforeAll') keeps subcommand --help output (e.g. elastic stack --help) terse. The callback returns '' when --json is set so --help --json stays valid JSON, and when the config has banner: false.

Closes #390.

Test plan

• npm run build
• diff <(env -u NO_COLOR FORCE_COLOR=1 node dist/cli.js) <(env -u NO_COLOR FORCE_COLOR=1 node dist/cli.js --help) → no diff
• env -u NO_COLOR FORCE_COLOR=1 node dist/cli.js --help | head -10 shows the colored ascii banner
• node dist/cli.js --help --json | jq .name → "elastic" (no banner corruption)
• node dist/cli.js stack --help → no banner (subcommand help unaffected)
• npm run test:unit → 1436/1436 pass

Made with Cursor

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ COPYPASTE	jscpd	yes		no	no	9.42s
✅ REPOSITORY	gitleaks	yes		no	no	61.74s
✅ REPOSITORY	git_diff	yes		no	no	0.06s
✅ REPOSITORY	secretlint	yes		no	no	33.6s
✅ REPOSITORY	trivy	yes		no	no	19.19s
✅ TYPESCRIPT	eslint	1		0	0	3.39s

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[JoshMock]

I like less sadness where possible. 😆

[JoshMock]

NOTICE.txt checks have been flapping. Not a blocker.