Create Stackchain Lab agent collaboration loop

.gitea/issue_template/task.md

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+---
+name: Lab Loop Task
+title: "[Task] "
+about: A bounded Timmy/Vincent collaboration ticket
+labels: "state:ready,priority:P1"
+---
+
+## Outcome
+
+What must exist or be decided?
+
+## Owner
+
+Choose exactly one: `agent:timmy` or `agent:vincent`.
+
+## Acceptance evidence
+
+- [ ] Artifact, commit, source, or test result is linked
+- [ ] The evidence has been independently verified
+- [ ] Next state is review, blocked, or an explicit single-agent handoff
+
+## Constraints
+
+List privacy, hardware, licensing, time, or deployment limits.