fix: Add 80% incremental coverage gating for WASM Go plugins

[Jing-ze]

Ⅰ. Describe what this PR did

This PR implements codecov patch-based incremental coverage gating for WASM Go plugins, requiring 80% coverage for new/modified code before PR merge.

• Added wasm-plugin-patch status check in codecov.yml with 80% coverage threshold
• Unified WASM plugin flags to wasm-go-plugin for consistent coverage tracking
• Fixed codecov report links to use correct app.codecov.io URLs

Ⅱ. Does this pull request fix one issue?

No specific issue, but improves code quality enforcement for WASM plugins.

Ⅲ. Why don't you add test cases (unit test/integration test)?

This PR modifies CI/CD configuration files and doesn't change application logic.

• Configuration updates in codecov.yml
• Workflow modifications in .github/workflows/wasm-plugin-unit-test.yml
• No functional code changes that require additional testing

Ⅳ. Describe how to verify it

1. Create a test PR with WASM plugin changes
2. Verify codecov upload succeeds (check GitHub Actions logs)
3. Check coverage status appears in PR with 80% threshold
4. Test coverage gating by adding code with <80% coverage
5. Confirm PR blocking when coverage threshold not met

Ⅴ. Special notes for reviews

• 80% incremental coverage threshold for all WASM Go plugins
• Dual gating system: 30% manual check + 80% codecov patch check
• Flag unification: All WASM plugins now use wasm-go-plugin flag

[lingma-agents]

为 WASM Go 插件添加 80% 增量覆盖率门禁与相关配置优化

变更概述

• 新功能

  • 在 codecov.yml 中新增 wasm-plugin-patch 覆盖率检查项，设定 80% 的增量覆盖率阈值，仅针对 plugins/wasm-go/extensions/** 路径下的代码变更生效。
  • 为 WASM Go 插件在 GitHub Actions 工作流中统一使用 wasm-go-plugin 标志上传覆盖率报告，并启用 fail_ci_if_error 以确保 CI 在上传失败时中断。

• 配置调整

  • 更新 codecov.yml 配置，为 default、wasm-plugin-patch 和 project 覆盖率规则统一设置 base: main，以确保覆盖率对比基于主分支。
  • 在 GitHub Actions 的总结输出中，更新 Codecov PR 报告链接格式为 https://app.codecov.io/gh/{repo}/pull/{number}，确保跳转正确。

• 问题修复

  • 修复 WASM 插件覆盖率上传步骤中缺少 flags 和错误处理配置的问题，增强覆盖率检查的可靠性。

• 其他

  • 在 plugins/wasm-go/extensions/ai-agent/dashscope/message.go 中添加了调试日志，记录 AddForSystem 方法的输入内容，便于调试追踪（此为辅助性变更，非核心逻辑）。

变更文件

文件路径	变更说明
.​github/​workflows/​wasm-plugin-unit-test.​yml	为 WASM 插件覆盖率上传步骤添加了统一的 flags 标识 `wasm-go-plugin`，并启用 `fail_ci_if_error` 确保上传失败时 CI 中断。同时更新了 Codecov PR 报告链接格式。
codecov.yml	新增 `wasm-plugin-patch` 覆盖率门禁规则，设置 80% 阈值并限定路径与标志。统一各覆盖率规则的 `base: main` 配置。
plugins/​wasm-go/​extensions/​ai-agent/​dashscope/​message.​go	引入 `log` 包并在 `AddForSystem` 方法中添加调试日志输出。

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 44.61%. Comparing base (810ef8f) to head (3aab38e).

Files with missing lines	Patch %	Lines
...s/wasm-go/extensions/ai-agent/dashscope/message.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3048      +/-   ##
==========================================
+ Coverage   43.42%   44.61%   +1.18%     
==========================================
  Files          82       85       +3     
  Lines       10922    11404     +482     
==========================================
+ Hits         4743     5088     +345     
- Misses       5850     5961     +111     
- Partials      329      355      +26     

Flag	Coverage Δ
wasm-go-plugin	71.16% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...s/wasm-go/extensions/ai-agent/dashscope/message.go	82.35% <0.00%> (ø)

... and 3 files with indirect coverage changes

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