feat: add github action to self-assign the issue

[Phoenix500526]

Summary

Add a github action to enable self-assignment.

Fixes #3773

Verification

AI use

Select exactly one:

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope:

Checklist

• Tests cover the change and fail without it
• Lint, format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes — described under Summary above
• No

[Astro-Han]

I reviewed this head and found blocking issues.

[P2] Actor-wide concurrency will drop pending commands

take.yml:30-31 groups only by github.actor without queue, so a second take from the same user on another issue cancels the pending job for the first issue. Commands are silently dropped. Must isolate by issue and use queue: max.

[P2] Mutation HTTP failures still show green

take.yml:47,54 POST/DELETE curl lacks --fail and status checks; any 403/404/422/5xx still exits 0 and the workflow remains green while assignee state is unchanged. Add failure handling and verification.

Standards hard: PR template says behavior=No but the workflow does change behavior (issue assignees), and verification is empty yet marked as passed — needs correction.

Checks on 6a0cf5557 are no checks — gate not met.

简体中文

存在并发与 HTTP 失败两项阻断及模板问题。

[Phoenix500526]

I reviewed this head and found blocking issues.

[P2] Actor-wide concurrency will drop pending commands

take.yml:30-31 groups only by github.actor without queue, so a second take from the same user on another issue cancels the pending job for the first issue. Commands are silently dropped. Must isolate by issue and use queue: max.

[P2] Mutation HTTP failures still show green

take.yml:47,54 POST/DELETE curl lacks --fail and status checks; any 403/404/422/5xx still exits 0 and the workflow remains green while assignee state is unchanged. Add failure handling and verification.

Standards hard: PR template says behavior=No but the workflow does change behavior (issue assignees), and verification is empty yet marked as passed — needs correction.

Checks on 6a0cf5557 are no checks — gate not met.

简体中文
存在并发与 HTTP 失败两项阻断及模板问题。

Done

[Astro-Han]

I reviewed this head and found no blocking issues.

The workflow now correctly isolates concurrency per issue with queue: max and handles HTTP failures with --fail and assignee verification. No injection, minimal permissions, and checklist now honest.

Checks on 12f52a3113 have no required test (workflow-only change) — gate is not applicable.

简体中文

该头未发现阻断。

[Astro-Han]

APPROVE — 12f52a3, no P0-P2, concurrency and HTTP handling fixed.