COMPETITOR-ALTERNATIVE-HELD-READINESS-01: record held readiness

[fermatmind]

What changed

• Added generated-only held/readiness evidence for competitor Alternative page candidates.
• Recorded implementation gates, claim guardrails, and exact next authorization prompts.
• Appended a sidecar issue for the operator-held competitor alternative blocker.

Why

• Competitor Alternative pages require source ledger and legal/claim review before any public content, route, CMS, or discoverability work.
• This PR records the hold and lets the train continue without implementing future scope.

Validation

• python3 -m json.tool backend/docs/seo/daily-runs/2026-07-06/competitor-alternative-held-readiness-01/scan_manifest.json >/dev/null
• python3 -m json.tool generated/pr-train-sidecar-issues/sidecar_issues.json >/dev/null
• git diff --check
• git diff --cached --check

Deferred items

• No competitor page copy, CMS, routes, frontend, JSON-LD, sitemap, llms, metadata, canonical, noindex, production import, or deployment changes.
• Source ledger gap audit and legal/claim review handoff remain separate generated-only cards.

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