chore: add AGENTS.md, tasks/todo.md, and tasks/lessons.md for workflow management

tasks/lessons.md

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+# Lessons
+
+## 2026-05-12
+
+- Trigger: the user corrected the execution workflow for non-trivial tasks and required persistent task tracking.
+- Rule: for any non-trivial task, create or update `tasks/todo.md` before substantive implementation, keep progress current, and do not mark done without review evidence.
+- Preventive action: check for `tasks/todo.md`, `tasks/lessons.md`, and repository guidance files before editing code; if the user corrects process expectations, record the rule immediately.
+
+- Trigger: the user required corrections to be persisted for future sessions.
+- Rule: any user correction must be recorded in `tasks/lessons.md` as `trigger -> rule -> preventive action`.
+- Preventive action: after any correction, update lessons before closing the task and mention the recorded rule in the final verification summary.
+
+- Trigger: the user clarified that this repository is meant to run in mainland China environments.
+- Rule: future code, build, deployment, and integration changes must consider mainland China network accessibility and should prefer China-friendly defaults where practical.
+- Preventive action: when adding dependencies, mirrors, external endpoints, or download flows, explicitly check whether the default path works reliably in mainland China and add configuration or fallback when needed.

tasks/todo.md

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+# Task Plan
+
+## Checklist
+
+- [x] Clarify scope, repository boundaries, and validation requirements for a repository-level AGENTS.md.
+- [x] Verify that the plan covers the user-specified workflow rules, project structure, and risk points.
+- [x] Create a complete AGENTS.md that embeds the requested workflow orchestration rules and repo-specific guardrails.
+- [x] Verify the generated AGENTS.md against the current repository structure and required workflow sections.
+- [x] Update the Review section with the final result and verification evidence.
+
+## Scope And Risks
+
+- Scope: add a repository-root AGENTS.md that governs future modifications across the Go backend, Vue frontend, deployment assets, and embedded Python managed services.
+- Risk: omit a repository area or validation command and leave future work under-constrained.
+- Risk: copy the requested workflow rules without adapting them to this repo's actual layout and toolchain.
+- Risk: finish without writing persistent task evidence for plan, review, and lessons.
+
+## Review
+
+- Status: completed.
+- Result: added a repository-root `AGENTS.md` plus `tasks/todo.md` and `tasks/lessons.md` to enforce the requested workflow for future non-trivial tasks.
+- Verification:
+  - confirmed `AGENTS.md` exists at the repository root;
+  - read back `AGENTS.md` and verified it covers workflow orchestration, task management, repo structure, validation matrix, and definition of done;
+  - matched required repository-specific references including `internal/webdevice/`, `managed/people_flow_project/`, `managed/store_dwell_alert/`, `tasks/todo.md`, and `tasks/lessons.md`.