COMPETITOR-ALTERNATIVE-SOURCE-LEDGER-GAP-AUDIT-01: add ledger gap audit

[fermatmind]

What changed

• Added generated-only source ledger gap audit for held competitor Alternative candidates.
• Defined required source ledger fields, source categories, forbidden claims, and next authorization prompts.
• Added a scan manifest with held candidate status and non-mutation scope guard.

Why

• Competitor Alternative pages need source mapping and claim review before any public implementation.
• This PR records what is missing without stating unverified competitor facts or creating future scope.

Validation

• python3 -m json.tool backend/docs/seo/daily-runs/2026-07-06/competitor-alternative-source-ledger-gap-audit-01/scan_manifest.json >/dev/null
• git diff --check
• git diff --cached --check

Deferred items

• No public copy, routes, CMS writes, comparative claims, JSON-LD, sitemap, llms, metadata, canonical, noindex, frontend code, production import, or deployment changes.
• Legal/claim review handoff remains a separate generated-only card.

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