落地任务复用治理规则与 worktree 对齐检查 [09-09-trellis-workflow-alignment]

2026-09-09 本地已验证完成、待交审的治理修复，一直未提交：

- 6 个 skill（trellis-before-dev/brainstorm/check/continue/finish-work/start）
  统一改为"先检查当前和直接相关既有任务，复用优先于新建"，取代原来"复杂任务
  先请求新建 task"的默认动作；新增 worktree/active-task 一致性校验步骤。
- project-governance.md 新增两节：Task Reuse（任务复用判据）、Active Task And
  Worktree Alignment（激活任务与实际执行 worktree 一致性检查，防止跨 worktree
  会话把上一个任务的 workflow-state 当成当前任务）。
- workflow.md 的 Request Triage / Parent-Child 章节、no_task 面包屑同步改写。

本地已过 task validate、check-trellis-governance.mjs、check-process-contract.mjs、
audit-docs.mjs、git diff --check；无业务代码改动。

Co-Authored-By: Claude Sonnet 5 <[email protected]>

.agents/skills/trellis-brainstorm/SKILL.md

@@ -29,9 +29,9 @@ Use this skill during Phase 1 planning to turn the user's request into clear req
 
 ## Preconditions
 
-Use this skill only after task-creation consent has been given and the user is ready to enter Trellis planning.
+Use this skill when the user is ready to plan within an existing task or has approved a genuinely needed new task. Follow project-governance.md → Task Reuse; no new-directory approval is needed merely to refine an existing contract.
 
-If no task exists yet, create one:
+First check the current and directly related existing tasks. Reuse one with matching ownership and acceptance, adding only missing requirements and checks. If none is suitable and creation is authorized, create one:
 
 ```bash
 TASK_DIR=$(python3 ./.trellis/scripts/task.py create "<short task title>" --description "<one-line summary>" --slug <slug>)