Add "lessons/patterns/use-fixes-n-keyword-for-automatic-issue-closing-in-prs"

lessons%2Fpatterns%2Fuse-fixes-n-keyword-for-automatic-issue-closing-in-prs.-.md

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+## Context
+
+- Created PR #292 with "Partial fix for #290" in the body
+- Expected Gitea to link the PR to the issue
+- Issue remained open after PR was merged
+
+## Problem
+
+Gitea only auto-closes issues when specific keywords are used:
+- `Fixes #N`
+- `Closes #N`
+- `Resolves #N`
+
+Using "Partial fix for #290" does NOT trigger auto-close because "Partial" is not a recognized keyword.
+
+## Solution
+
+For PRs that fully address an issue:
+- Use `Fixes #N` in the PR body or commit message
+
+For PRs that partially address an issue:
+- Use `Fixes #N` if you want auto-close anyway
+- OR manually close the issue after merge
+- Consider creating separate issues for remaining work
+
+## Prevention
+
+When creating PRs:
+1. Always use `Fixes #N` format for issue linking
+2. If partial fix, decide upfront: auto-close or keep open
+3. Add remaining work items to issue comment before closing
+4. Or create follow-up issues for remaining criteria
+
+## Related
+
+- Issue: #290
+- PR: #292
+
+---
+**Tags:** gitea, pr, issue-linking, workflow, auto-close