chore(release): promote proactive DAG routing - #225

Release scope

• make the main conversation proactively own project-level orchestration while child sessions remain leaf executors
• add freely composable explore, plan, prototype, coding, debug, verify, review, and synthesis blocks
• resolve bulk work to standard models and judgment gates to advanced models
• support saved-route list, read, retarget, and inline start without exposing YAML editing
• prevent child sessions from recursively starting workflow DAGs
• package four reference routes from the dedicated config repository
• align command-contract tests and preserve empty-or-whitespace guarding

Review

• Standards review: no findings
• Spec review: no findings
• focused DAG and prompt tests: 103 pass
• command contract tests: Core 19/19 and OpenCode 7/7
• repository lint: 4850 warnings / 0 errors
• full typecheck: 29/29

Dev promotion gates

• Typecheck: pass
• CodeQL: pass
• Unit Tests (linux): pass
• E2E Tests (linux): pass
• E2E Tests (windows): pass
• generated client and SDK freshness: pass
• HttpAPI Exerciser: pass

Source PRs: #223 and #224.