chore(ci): close stale issues after 14 additional days

.github/workflows/stale.yml から始め、特に issue と pull request のクローズ用入力および stale メッセージを確認してから、CONTRIBUTING.md:99-101 を見て文書化されたポリシーを確認します。固定された actions/stale v10.4.0 の入力を検証し、workflow YAML をレンダリングし、mise run pre-commit を実行して、既存の stale issue を監査したうえで、issue のクローズが有効になっている一方、PR のクローズは無効のままであることを確認します。

Problem Statement

OpenShell currently marks inactive issues as state:stale after 14 days but never closes them. Maintainers want issues that remain stale for another 14 days to close automatically, while preserving the ability to keep an issue open by commenting or removing the stale label.

Technical Context

The repository already uses the pinned actions/stale v10.4.0 action in a daily workflow. The action supports the requested issue lifecycle directly, but .github/workflows/stale.yml explicitly disables closure by setting days-before-issue-close: -1. The same workflow handles pull requests, so the issue policy must remain separate from PR handling.

Affected Components

Component	Key Files	Role
Stale automation	.github/workflows/stale.yml	Schedules stale processing and configures issue and PR marking, messages, exemptions, and closure
Contributor policy	CONTRIBUTING.md	Documents stale lifecycle behavior and exemptions
Issue triage automation	.github/workflows/issue-triage.yml	Applies the existing state:triage-needed exemption to incoming community issues

Technical Investigation

Architecture Overview

The Mark stale issues and pull requests workflow runs daily at 08:17 UTC and can also be dispatched manually. Its job grants issues: write and pull-requests: write, then invokes a SHA-pinned actions/stale release. The action tracks inactivity from GitHub item updates, adds state:stale after the configured threshold, removes the label after qualifying activity by default, and can close an item after a second threshold.

Issue and PR controls are separate. Both become stale after 14 days, but both close thresholds are currently -1, which disables closing. This is not dry-run mode despite the workflow comments; the action's actual dry-run input is debug-only.

Code References

Location	Description
.github/workflows/stale.yml:3-6	Daily schedule and manual dispatch entry points
.github/workflows/stale.yml:14-16	Existing write permissions already sufficient for closing issues
.github/workflows/stale.yml:18	SHA-pinned actions/stale v10.4.0 invocation
.github/workflows/stale.yml:23-26	Issues and PRs become stale after 14 days; closure is disabled with -1
.github/workflows/stale.yml:28-29	Issue exemptions and not_planned close reason
.github/workflows/stale.yml:31-42	Messages still describe a seven-day close window even though closure is disabled
.github/workflows/issue-triage.yml:47-57	Applies state:triage-needed, one of the existing stale exemptions
CONTRIBUTING.md:99-101	Documents state labels and currently inaccurate seven-day close behavior

Current Behavior

After 14 days without activity, issues and PRs receive state:stale and a comment. Subsequent qualifying activity removes the stale label under the action's default remove-stale-when-updated: true behavior. Items labeled state:triage-needed or roadmap are exempt from issue processing.

Neither issues nor PRs close because both days-before-*-close values are -1. The issue and PR messages nevertheless say closure may occur after seven days, and CONTRIBUTING.md repeats that policy. Workflow permissions require no change.

What Would Need to Change

In .github/workflows/stale.yml, set days-before-issue-close: 14, correct the misleading dry-run comment, and update the issue messages from seven to 14 days. Keep days-before-pr-close: -1 because the request concerns issues; remove the false closure promise from the PR stale message and either remove the inert PR close message or leave it clearly inactive.

Update CONTRIBUTING.md to state that issues close after 14 additional inactive days while PRs are only marked stale. Keep the existing not_planned close reason unless maintainers want different reporting semantics.

Before rollout, review existing stale issues and decide whether active workflow states need exemptions. At investigation time, 38 open issues carry state:stale, including issues also labeled state:in-progress, state:agent-ready, state:review-ready, state:pr-opened, and needs-rfc. Old stale issues may close as soon as a scheduled run reaches them after the configuration lands.

Alternative Approaches Considered

A separate workflow, custom script, or replacement bot could implement delayed closure but would duplicate functionality already provided by actions/stale, add maintenance cost, and require custom tests. The existing issue-specific close input is the smallest correct approach.

Increasing operations-per-run could process the backlog faster, but the default limit of 30 is already consumed by normal runs and changing it would increase the size of the initial closure burst. Keep the default unless maintainers explicitly prefer faster cleanup after reviewing API limits and backlog impact.

Patterns to Follow

Keep the action pinned to an immutable SHA with its release comment. Retain least-privilege job permissions and let Dependabot manage action updates. Document repository-governance behavior in CONTRIBUTING.md; no product or architecture documentation is needed.

Proposed Approach

Use the existing action's issue-specific days-before-issue-close: 14 input and keep PR closure disabled. Align issue and PR messages with their actual behavior and update contributor documentation. Preserve automatic unstaling, current issue exemptions, and the not_planned close reason. Audit the existing stale backlog before merge and add only those workflow-state exemptions that reflect maintainer policy.

Scope Assessment

• Complexity: Low
• Confidence: High - the pinned action directly supports the requested behavior
• Estimated files to change: 2
• Issue type: chore

Risks & Open Questions

• Should stale issues with state:in-progress, state:agent-ready, state:review-ready, state:pr-opened, topic:security, or needs-rfc be exempt from closure?
• Should maintainers accept immediate gradual closure of the existing stale backlog, or first remove stale labels from issues that should remain open?
• Keep close-issue-reason: not_planned for accurate GitHub reporting, or use another reason?
• actions/stale retains state:stale after closure. Is that desirable as lifecycle history? Removing it would require separate custom automation.
• Scheduled execution and the action's operation limit mean closure occurs after at least 14 additional days, not at an exact deadline.
• Existing stale comments mentioning seven days cannot be corrected retroactively.

Test Considerations

• Validate input names against the pinned actions/stale v10.4.0 action.yml and review the rendered workflow YAML.
• Run mise run pre-commit; no OpenShell unit or sandbox end-to-end tests are needed for this workflow-only change.
• Audit currently stale issues before merge and apply agreed exemptions or remove stale labels as needed.
• After merge, manually dispatch the workflow or inspect its next scheduled run.
• Confirm logs report Days before issue close: 14 and Days before pull request close: -1.
• Spot-check closure message, not_planned reason, retained stale label, and unstale-on-activity behavior.

Documentation and Platform Impact

Update CONTRIBUTING.md only. This does not affect published product docs, architecture docs, gateway TOML, Helm, compute drivers, sandbox infrastructure, or cluster guidance. It has no SELinux, AppArmor, Landlock, seccomp, process identity, /proc, or other LSM impact.

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Created by spike investigation. Use build-from-issue to plan and implement.