planning: add issue fix-status-locked-issue-display to 2.1

Fix status display to show issues locked by another session as in-progress

Author: cowwoc

.cat/issues/v2/v2.1/fix-status-locked-issue-display/index.json

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+{"status": "open"}

.cat/issues/v2/v2.1/fix-status-locked-issue-display/plan.md

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+# Plan
+
+## Goal
+
+Fix the status display to show open issues that are locked by another session as in-progress (🔄)
+instead of open (🔳). Currently, when another Claude session holds a lock on an issue, the status
+box still shows the issue as open, leading to incorrect suggestions that it is available to work on.
+
+Scope: status box only. All locks (active or stale) are treated as in-progress. The 🔄 indicator
+is used (same as current session's in-progress issues).
+
+## Pre-conditions
+
+(none)
+
+## Post-conditions
+
+- [ ] Issues locked by another session are displayed as 🔄 (in-progress) in the status box instead of 🔳 (open)
+- [ ] Regression test added verifying locked issues appear as in-progress in the status display
+- [ ] No new issues introduced
+- [ ] E2E verification: acquire a lock on an issue from one session context, run status from another session context, confirm the locked issue shows as 🔄