docs: bootstrap vault, roadmap and research

docs/tasks/0001-bootstrap-cargo-project-and-ci.md

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+---
+type: task
+status: todo
+priority: P0
+sprint: 0
+gitea-issue: "#1"
+created: 2026-10-17
+due: 
+tags: [task, ci]
+---
+
+# Bootstrap cargo project and CI
+
+## Goal
+A compiling `viexp` crate with lib/bin split, one passing test, and green Gitea Actions CI.
+
+## Acceptance criteria
+- [ ] `cargo new`-style skeleton: `src/main.rs` + `src/lib.rs` (`main` calls `viexp::run()`)
+- [ ] `cargo test` green with one sanity test
+- [ ] `.gitea/workflows/ci.yml`: `fmt --check` + `clippy -D warnings` + `test` on push
+- [ ] First Conventional Commit pushed to `main`
+
+## Notes
+Rust Book ch. 1–2; see [[sprints/sprint-00-setup|Sprint 0]] drill D2/D4.
+
+## Log
+- 2026-10-17 — task created.

docs/tasks/0002-verify-rust-toolchain-and-fast-feedback.md

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+---
+type: task
+status: todo
+priority: P0
+sprint: 0
+gitea-issue: "#3"
+created: 2026-10-17
+due: 
+tags: [task, tooling]
+---
+
+# Verify Rust toolchain and fast-feedback loop
+
+## Goal
+`bacon` runs check + clippy + test on every save, so no practice minute is wasted on manual rebuilds.
+
+## Acceptance criteria
+- [ ] `rustup default stable`; `rustc --version` recorded in DevLog
+- [ ] `clippy` and `rustfmt` components installed
+- [ ] `bacon` installed and configured (check + test jobs)
+- [ ] Editor shows inline errors (rust-analyzer) — verify once
+
+## Notes
+Command reference: `rustup component add clippy rustfmt`; `cargo install --locked bacon`.
+
+## Log
+- 2026-10-17 — task created.