feat: output JSON by default in scan sbom command; rename created files to herodevs.*

[rlmestre]

See individual commits.

Closes https://github.com/neverendingsupport/data-and-integrations/issues/61
Closes https://github.com/neverendingsupport/data-and-integrations/issues/59

[Copilot]

Pull Request Overview

This PR changes the default output of the scan sbom command to JSON and renames all generated files to use a herodevs prefix instead of eol.

• Introduce filenamePrefix in config and apply it across services, commands, tests, and docs
• Always output SBOM JSON by default and only write files when --save is used
• Update tests, package scripts, and README to reflect the new herodevs.* naming

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/service/sbom.background.test.ts	Updated expected background log path to herodevs.sbom.json
test/service/purls.svc.test.ts	Renamed test name to expect herodevs.purls.json
src/service/purls.svc.ts	Updated doc comment to reference herodevs.purls.json
src/service/eol/sbom.worker.ts	Imported filenamePrefix and used it for output path
src/config/constants.ts	Added filenamePrefix constant
src/commands/scan/sbom.ts	Always include --json, rename saved SBOM using prefix, and log JSON when not saving
src/commands/scan/eol.ts	Renamed report paths and flag descriptions to use prefix
src/commands/report/purls.ts	Renamed purls report output paths to use prefix
src/commands/report/committers.ts	Renamed committers report output paths to use prefix
package.json	Updated clean:files script to use herodevs prefix
e2e/scan/eol.test.ts	Updated e2e paths to use filenamePrefix
README.md	Updated flags/docs to reference herodevs.* files

Comments suppressed due to low confidence (2)

e2e/scan/eol.test.ts:11

• The imported config is not used in this test file; consider removing it to avoid an unused import.

import { config, filenamePrefix } from '../../src/config/constants';

package.json:20

• The clean:files script targets .text files, but generated committers reports use .txt. Update the pattern to herodevs.**.txt to clean those files correctly.

"clean:files": "shx rm -f herodevs.**.csv herodevs.**.json herodevs.**.text",