docs: establish integrated project memory

.project-docs/30-worklog/task-template.md

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+# Task: {title}
+
+## Identity
+
+- Task ID: {task_id}
+- Mode: {mode}
+- Branch: {branch}
+- Worktree: {worktree}
+- Base commit: {base_commit}
+- Owner: {owner}
+- Status: Planning
+
+## Scope
+
+- {scope}
+
+## Intent And Constraints
+
+- {intent_or_constraint}
+
+## Outcome
+
+- Not completed.
+
+## Verification
+
+- Not run.
+
+## Follow-ups
+
+- None recorded.
+
+## Promotion Candidates
+
+- None recorded.