feat(voteballots): add shell integration payload contract (Slice 6/6)

[Foundup]

Summary

• Implements local shell payload contract for future p.fMALL Vote shell consumption
• Packages QuickAnswer data into VoteShellPayload with routing metadata
• Preserves all answer lines, confidence labels, source traces, and human review triggers exactly
• LOCAL_SHELL_PAYLOAD_ONLY - no route activation, no public launch, no manifest mutation

Shell Payload Contract

Field	Source	Preserved
foundup_id	foundup_manifest.json	Readonly
route_namespace	WSP 104	Readonly
app_mount	Convention	Not activated
lines	QuickAnswer	Exact copy
confidence_label	QuickAnswer	Exact
trail_termination_markers	QuickAnswer	Exact
human_review_triggers	QuickAnswer	Exact copy
display_ready	is_answer_ready_for_display()	Computed

Vote PoC Chain Completion

Slice	PR	Status
Slice 1: FEC Adapter	#707	Merged
Slice 2: Entity Resolution	#709	Merged
Slice 3: Funding Summary	#710	Merged
Slice 4: Confidence Scoring	#712	Merged
Slice 5: Quick Answer	#713	Merged
Slice 6: Shell Integration	This PR	Ready

Vote PoC Chain Lane: 6/6 slices COMPLETE

Test Plan

• 303 tests pass (241 existing + 62 new shell integration tests)
• Ready QuickAnswer produces SUCCESS payload
• Not-ready QuickAnswer produces NOT_READY_FOR_DISPLAY (fail-closed)
• foundup_id = "voteballots", route_namespace = "/f/voteballots", app_mount = "/f/voteballots/app"
• Answer lines preserved exactly (copy, not reference)
• Confidence labels, source trace, trail termination, human review all preserved
• Validation accepts complete payload, rejects missing fields
• No public files created, no manifest mutation
• No LLM/network/API key required
• No persuasion/recommendation/targeting language
• Full pipeline integration test passes
• All 6 slice imports work together

WSP 97 Truth Boundary Checklist

30/30 YES - see audit doc for full matrix

Worker-Lane: W6
Slice: VOTE_POC_SHELL_INTEGRATION_PHASE1

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