docs: keep Rust tests under tests directory

AGENTS.md

@@ -3,3 +3,9 @@
 Vamp is a single-user, pre-alpha tool. Prefer clean cutovers to the simplest current design across code, configuration, interfaces, and persisted formats. Update callers and remove obsolete paths together; add backwards compatibility or migrations only when explicitly requested.
 
 Report incompatible persisted data clearly and preserve it unless the user explicitly requests a reset or deletion.
+
+# Tests
+
+Keep project tests and test-only fixtures/helpers under `tests/`. `src/` may retain test-module declarations and minimal test hooks; keep test bodies outside implementation files and preserve private access rather than widening production APIs.
+
+When adding or moving tests, follow [test organization](docs/development.md#test-organization) for module wiring and verification.

TODO.md

@@ -1,36 +1,3 @@
-- [x] we should be able to execute commands in visual mode, since some commands may relevant to selections.
-- [x] diff view: local review UX first, independently of GitHub integration, for reviewing local changes and delivering feedback to coding agents.
-	- add comments at the caret or on selected line ranges on either diff side; compose/edit with normal editor interaction, delete drafts, navigate comments, and open a review overview.
-	- use gutter markers and a focused floating comment editor over the whole diff text workspace, without adding source-side splits or inserting comment text into source rows.
-	- support a review summary and local verdict: Looks good / Changes requested.
-	- save and reopen reviews using local files that coding agents can read; no server or client/server protocol.
-	- anchor comments to immutable revision IDs, paths, sides, and source line ranges, never screen coordinates or mutable file indices.
-	- preserve original anchors and mark comments stale when the reviewed snapshot no longer matches; defer automatic reanchoring.
-- [x] diff view: attach local review comments to arbitrary contiguous text ranges, not only containing lines.
-	- preserve exact start/end source positions in grapheme coordinates with an exclusive end, including partial-line and multiline selections on either diff side.
-	- characterwise Visual (`v`) anchors the exact selected text; Visual Line (`V`) anchors whole selected lines; no selection retains current-line behavior.
-	- retain gutter markers for discovery and highlight the exact anchored text when its comment is selected.
-	- preserve immutable snapshot identity and existing stale detection; never silently reanchor comments after source changes.
-	- persist precise ranges in version 2 JSON import/export. SQLite storage follows in the next item.
-	- future GitHub publishing may map precise local anchors to supported line ranges without reducing precision in the local review.
-- [x] persist local reviews automatically in a local SQLite database using rusqlite; no server, hosted storage, or synchronization.
-   - keep one database under $XDG_DATA_HOME/vamp/reviews/, falling back to ~/.local/share/vamp/reviews/; allow a configurable review_directory.
-   - key reviews by repository identity and persistent review ID, preserving reviews and stale comments across revision changes.
-   - autosave committed comment edits and summaries when dismissing or switching review editors; save verdicts and deletions immediately, using transactions rather than per-keystroke writes.
-   - automatically reopen the repository's sole review; offer a selector when several exist.
-   - retain explicit JSON export/import for sharing with coding agents; export must not redirect subsequent autosaves away from the database.
-   - version the database schema; use review-version checks to reject conflicting edits from multiple editor instances.
-   - surface write failures and conflicts without discarding drafts or marking unsuccessful saves as persisted.
-   - persist the precise start/end grapheme anchors without reducing them to line ranges.
-- [x] diff view: local coding-agent review loop through a read-only `vamp --review` CLI.
-    - list repository reviews and show committed feedback; return exact anchors and grapheme excerpts without repeating full source files.
-    - show unresolved comments by default; `--all` includes resolved comments.
-    - manually resolve/unresolve comments in Vamp, independently of staleness; persist status in SQLite and version 3 JSON.
-    - preserve filename arguments, configured storage, and incompatible data; no MCP, agent replies, or automatic dispatch.
-- [x] add an option for three pane left/base/right view for conflict resolution.
-    - alternative pane layout as left/right with base underneath (`config.resolve_history_layout = "base_below"`)
-- [x] pull out tests from implementation code, and place them in a dedicated test folder.
-    - private unit tests live in `tests/unit/`, alongside the existing `tests/*.rs` integration suites.
 - [ ] diff view: GitHub code review integration after the local review UX is usable.
 	- publish local reviews explicitly: general PR comments, inline line/range comments, review summaries, approval, and requests for changes.
 	- preserve explicit PR identity and reviewed commit IDs; validate anchors against GitHub's PR diff and recheck the PR head before submission.