feat(tui): add agent collaboration visualization with debates and consensus

[JeremyDev87]

Summary

• Add collaboration/ module with AgentOpinion protocol (stance: approve/concern/reject), DiscussionEngine for tracking multi-round debates, and TerminalFormatter for colored markdown output
• Add AgentDiscussionPanel TUI component that replaces FlowMap when discussion data exists, showing agent opinions, cross-reviews, stance changes, and consensus meter
• Add discussionRounds field to DashboardState with graceful FlowMap fallback when no discussion data
• 47 new tests (TDD for engine/formatter, test-after for TUI), all 187 test files passing (5071 tests, 94.76% coverage)

Test plan

• All 187 existing test files pass (0 regressions)
• Types: AgentOpinion, Stance, CrossReview, DiscussionRound, ConsensusResult validated (11 tests)
• DiscussionEngine: addOpinion, addCrossReview, nextRound, getConsensus, getAgentStanceHistory, reset (10 tests)
• TerminalFormatter: formatOpinion, formatCrossReview, formatConsensus, formatDiscussionRound (11 tests)
• AgentDiscussionPanel pure functions: renderOpinionLine, renderCrossReviewLine, renderConsensusLine, renderDiscussionPanel (10 tests)
• AgentDiscussionPanel Ink component: renders opinions, consensus, cross-reviews, empty state, height truncation (5 tests)
• lint, format:check, typecheck, circular, build all pass

Closes #831

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Project	Deployment	Actions	Updated (UTC)
codingbuddy-landing	Ready	Preview, Comment	Mar 25, 2026 2:44am