[CI] Reduce Claude review analysis turns

[jayhenry]

Summary

• Document the prepared JSON/JSONL/TSV bundle schema in the review prompt.
• Combine manifest, PR metadata, changed files, and diff offsets into one initial jq call.
• Defer discussion deduplication until Warning+ candidates exist, then use one targeted TSV query and an optional JSONL follow-up.
• Provide valid git grep forms with all options before -e <pattern> and avoid pipelines that hide Git failures.

Motivation

Run 31704822761 used 30 analysis turns. Three initial calls separately loaded snapshot metadata and file inventory, the initial discussion preview produced 44.7 KB before truncation, and two git grep calls failed because -A / -l appeared after the pattern. This prompt change targets those avoidable turns without lowering the external 34-turn limit or the 28-call analysis budget.

Validation

• Parsed .github/workflows/claude-general.yml and asserted the prompt contract.
• Executed the aggregate jq expression against representative manifest, PR, files, and diff-index data.
• git diff --check upstream/main...HEAD