feat(core): tiered orchestration doctrine, depth ladder, verdict disposal contract

[LeXwDeX]

Summary

Full restructure of the dag-flow orchestration manual plus a TUI sidebar fix, driven by a real-run diagnosis of shallow orchestration (/dag-flow review produced a flat 6-node graph whose REVISE verdict died silently at the terminal boundary).

Orchestration manual (packages/core/src/plugin/command)

• Tiered Orchestration Doctrine (policy, governing): advanced-tier nodes conduct/check (decomposition, gates, claim verification, arbitration); standard-tier nodes carry volume; accuracy is bought with breadth (concurrent fan-out, N-sampling) and depth (verdict-gated waves). Tier placement bound to the mechanical lever: required: true / review* workers → advanced tier of dag.jsonc (matches DagConfig.tierModel).
• Depth Ladder: hard minimum waves by target size — module scope requires exploration → analysis → claim verification → arbitration; "a single wave of parallel opinions is a poll, not a review".
• Verdict Disposal Contract: non-ACCEPT checkpoint verdicts MUST be disposed in the wake turn (extend / pause-replan-resume / new workflow / reasoned stop) — closes the gap where the runtime orchestrator_unresponsive guard only fires for live workflows, so terminal checkpoints escaped all enforcement.
• workflow.md: five-phase lifecycle compressed 175→12 lines (it is also the workflow tool description — per-turn token tax); adversarial-review example gains a condition: verdict != ACCEPT continuation node ending the arbiter dead-end; terminal-boundary facts documented; dag-flow.txt gains blast-radius graph scaling.
• 12 dag-prompts templates shipped (.opencode/dag-prompts/): the manual's template list previously pointed at files that did not exist anywhere — nodes using { id: ... } failed at spawn. Hard-contract style: falsifiable judgment conditions, file:line evidence discipline, unverified_claims sections feeding the verification wave, normalized verdicts.
• Dead dag_templates/_example.yaml removed (referenced nonexistent dagworker tool).
• Tests: +3 assertion blocks pinning doctrine/ladder/contract, +1 pinning the example fix.

TUI (packages/tui)

• DAG sidebar panel: header chevron always rendered and collapsible (was gated on >2 workflows — unreachable, misaligned with MCP); node list ordered by topological waves via computeWaves (was reverse insertion order from desc(seq)).

Test plan

• packages/core command.test.ts: 16 pass / 174 assertions
• packages/opencode command.test.ts + dag-templates.test.ts: 29 pass
• packages/tui dag-inspector-utils.test.ts: 19 pass
• tsgo --noEmit clean on core and tui