Add scoped Agent-mode pipeline as experimental Classic fork.

Wire specialist waves, Brain consolidation, and Classic-compatible reports so Agent mode can run end-to-end via OpenRouter without changing the default Classic path.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/agents/prompts.py

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+"""Prompts unique to the scoped Agent pipeline."""
+
+COMPLETENESS_SYSTEM_PROMPT = """You are a senior construction-document completeness reviewer.
+Review only the supplied sheet index and aggregate counts. Identify missing sheets,
+schedules, details, or clearly incomplete coverage. Do not infer drawing facts and do
+not report direct design conflicts. A missing-information finding may use the sheet
+index itself as evidence. Respond only with valid JSON."""
+
+COMPLETENESS_USER_PROMPT = """Review this summarized drawing set for completeness.
+Return {"issues":[{"issue_id":"string","source_stage":"qaqc","category":"missing_sheet | missing_schedule | missing_detail | missing_information | bid_readiness | permit_readiness | other","severity":"critical | high | medium | low","confidence":"high | medium | low","location":"sheet or drawing set","disciplines":["string"],"sheets":["string"],"description":"string","evidence":[],"recommended_resolution":"string","code_reference":null}]}.
+Sheet index: {sheet_index}
+Aggregate sheet summaries: {sheet_summaries}
+Cluster summary: {cluster_summary}"""
+
+BRAIN_SYSTEM_PROMPT = """You are the central decision layer for a construction drawing
+review. Merge duplicate specialist findings, reject vague or unsupported findings,
+preserve verbatim evidence, and prioritize the kept issues. Do not create new issues.
+Conflicts need drawing evidence; completeness findings may instead cite an explicit
+missing item from the sheet index. Return only valid JSON."""
+
+BRAIN_USER_PROMPT = """Judge and consolidate these scoped specialist findings.
+Return {"issues":[{"issue_id":"string","source_stage":"conflict | qaqc | code | constructability","category":"string","severity":"critical | high | medium | low","confidence":"high | medium | low","location":"string","disciplines":["string"],"sheets":["string"],"description":"string","evidence":[{"discipline":"string","sheet":"string","source_text":"string","asserted_value":"string"}],"recommended_resolution":"string","code_reference":"string or null","risk_score":1,"recommended_priority":"immediate | before_bid | before_permit | before_construction | track_only"}],"decisions":[{"finding_refs":["string"],"action":"kept | merged | dropped","reason":"string","kept_issue_id":"string or null"}]}.
+Sheet index: {sheet_index}
+Jurisdiction summary: {jurisdiction}
+Specialist findings: {findings}"""