Optimize Opus 5 workflow prompts and execution contracts

[shinpr]

Summary

• Optimize Opus 5 workflow prompts for execution efficiency while preserving mandatory orchestration and task tracking.
• Tighten agent handoff and output contracts across implementation, quality, integration-test, security, and verification flows.
• Reduce duplicated prompt content and move shared execution rules to their canonical skills.
• Align generated plugin namespaces, skill metadata, and package versions for the 0.22.8 release.

Key changes

• Bound exploration and completed diffs to approved decisions, scope, and total size budgets.
• Gate task expansion on Direct MVP and sourced hard constraints.
• Carry mutation evidence, authoritative quality commands, governing documents, and blocked states through their consumers.
• Add first-pass irreversible-risk coverage, shared-mutation route parity, and consumer-observable capability postconditions.
• Centralize post-verification fix-task handoff and remove redundant recipe guidance.
• Validate generated local agent namespaces during plugin sync.

Validation

• pnpm run sync
• pnpm run sync:check
• pnpm run check:skills-index
• claude plugin validate --strict .claude-plugin/marketplace.json
• Strict validation for all four generated plugins
• git diff --check