[Task] Finalise report artifact placement and script outputs

[ashleyshaw]

Deliverables

1. Report artefact relocation from root into .github/reports canonical folders.
2. Script output path updates to prevent root recontamination.
3. One successful run of updated scripts proving new paths are active.

Acceptance Criteria

• audit-frontmatter-report.csv is generated into .github/reports/audits/frontmatter.
• footer-violations artifacts are stored in an archived reports namespace.
• Updated script run succeeds end-to-end with no path errors.
• Root inventory confirms these generated files do not return.

Spec Source

• .github/projects/active/root-cleanup-dependency-audit-2026-06-03/openspec-strict/children/01-3-task-finalise-report-artifact-and-script-paths.md

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Definition of Ready (DoR)

• Task described and scoped
• Estimate added if relevant

Definition of Done (DoD)

• Task completed and documented
• Changelog entry prepared for PR
• PR uses correct branch prefix

[linear-code]

LS-919