docs: bootstrap vault, roadmap and research

TMP/Sprint.md

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+---
+type: sprint
+number: 
+status: planned
+started: 
+finished: 
+hours-planned: 20
+hours-logged: 0
+tags: [sprint]
+---
+
+# Sprint {{title}}
+
+## Theme
+One line: the single sub-skill + app feature this sprint is about.
+
+## App deliverable
+The concrete, demoable thing that must exist at the end of the sprint.
+
+## Rust focus — the vital 20%
+Syntax and concepts to practice, each mapped to real app code.
+
+## Practice drills (20–30 min each)
+- [ ] Drill 1
+- [ ] Drill 2
+- [ ] Drill 3
+
+## English focus
+What and how we practice this sprint (README section, commit messages, article…).
+
+## Session rhythm (45 min)
+5 min — review yesterday's log and errors → 30 min — focused practice → 10 min — DevLog + ErrorJournal.
+
+## Definition of done
+- [ ] Deliverable works
+- [ ] `cargo test` green
+- [ ] clippy clean
+- [ ] Retro filled in below
+
+## Retrospective
+### Shipped
+### Frustrations (link ErrorJournal entries)
+### Hours logged / English notes