docs: SESSION_HANDOFF refresh for session 8 (Quat smoke-test round)

Captures the three bug-fix commits (move validation, deal-tween leak,
softlock detection), notes that bug #3's "no end-game screen" was
downstream of the softlock-detection bug and is now resolved, and
records the two investigation findings (audio-stack feature trim,
solver-at-deal toggle) as deferred decisions for the player.

Updates HEAD/test counts (origin at 2716472, 1126 tests passing).
Cleans the next-round candidates list — calendar / thumbnails /
Time-Attack auto-save shipped between v0.13.0's doc commit and
session 8; replay is WIP in the working tree.

Resume prompt now offers six choices (A–F) covering finish-replay,
smoke-test, audio-feature trim, solver toggle, other UX, packaging.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

SESSION_HANDOFF.md

@@ -1,20 +1,20 @@
 # Solitaire Quest — UX Overhaul Session Handoff
 
-**Last updated:** 2026-05-02 (session 7, late-late) — Third UX iteration round complete on top of v0.12.0. Six post-handoff candidates shipped plus two code-review fixes. Ready to tag v0.13.0.
+**Last updated:** 2026-05-02 (session 8, post-Quat smoke test) — Quat playtested and reported four bugs + two investigation tasks. Three of the four bugs are fixed and pushed; the fourth was downstream of #2 and is now resolved without new code. Replay-feature WIP is back in the working tree.
 
 ## Status at pause
 
-- **HEAD:** doc-commit closing this round (CHANGELOG + handoff). Local master has the impending tag at this commit.
+- **HEAD on origin:** `2716472`. Three bug-fix commits pushed (`f1aeb24`, `3eabc14`, `2716472`) on top of the v0.13.0-era HEAD `0001432`.
-- **Working tree:** clean apart from untracked `CARD_PLAN.md` (intentional).
+- **Working tree:** WIP for the replay feature is restored (`solitaire_data/{lib,settings,stats}.rs`, `solitaire_data/src/replay.rs` new, `solitaire_engine/{game_plugin,lib,settings_plugin,stats_plugin,win_summary_plugin}.rs`, `solitaire_sync/{merge,stats}.rs`). Plus untracked `CARD_PLAN.md` (intentional).
-- **Build:** `cargo clippy --workspace --all-targets -- -D warnings` clean.
+- **Build:** `cargo clippy --workspace --all-targets -- -D warnings` clean — bug fixes + WIP coexist.
-- **Tests:** **1053 passed / 0 failed** across the workspace (+22 from v0.12.0's 1031 baseline).
+- **Tests:** **1126 passed / 0 failed** across the workspace (+ Quat's softlock case as a new regression test).
-- **Tags on origin:** `v0.9.0`, `v0.10.0`, `v0.11.0`, `v0.12.0`. v0.13.0 is the next tag.
+- **Tags on origin:** `v0.9.0`, `v0.10.0`, `v0.11.0`, `v0.12.0`. v0.13.0 still pending — its content shipped but the tag was never pushed; consider rolling its scope into v0.14.0 along with the bug fixes + replay feature.
 
 ## Where we are
 
-Post-v0.12.0 the handoff listed six "next-round candidates" — every one shipped today plus two code-review fixes (font handling unified to bundled-only, sccache wiring removed). v0.13.0 is the right slice.
+Post-v0.12.0 the handoff listed six "next-round candidates" — every one shipped plus two code-review fixes. v0.13.0 was prepared but not pushed. Then session 8 ran a smoke-test pass with Quat that surfaced four real bugs and two investigation tasks; three of the four bugs landed today, the fourth was downstream of #2 and is now resolved.
 
-The candidate list is exhausted again. Direction is open.
+Direction is open.
 
 ### Design direction (unchanged)
 
@@ -37,22 +37,41 @@ The candidate list is exhausted again. Direction is open.
 | Drag-with-keyboard | `a0fc0d2` | Tab → Enter → arrows → Enter completes a move without a mouse. New `KeyboardDragState` resource; mutual exclusion with mouse drag via `KEYBOARD_DRAG_TOUCH_ID` sentinel. Help + onboarding hotkey lists updated. |
 | Right-click radial | `b37f0cb` | Hold RMB on a face-up card → ring of icons at the cursor, one per legal destination; release over an icon → `MoveRequestEvent`. New `RadialMenuPlugin`. Help controls reference gains a "Mouse" section. |
 
+## Session 8 (shipped 2026-05-02 post-Quat)
+
+Quat playtested current `master` and reported 4 bugs + 2 investigation items. Bug #3 turned out to be downstream of bug #2 — the `GameOverScreen` and `WinSummaryOverlay` modals already exist with new-game buttons; the softlock screen just never spawned because the old `has_legal_moves` returned `true` whenever stock had cards. With #2 fixed, the existing screen will fire for Quat's case. Smoke-test verification on the player side is the last step.
+
+| Area | Commit | What landed |
+|---|---|---|
+| Move validation (#1) | `f1aeb24` | `solitaire_core::rules::is_valid_tableau_sequence(&[Card]) -> bool` checks every adjacent pair in a moved stack descends one rank with alternating colour. Wired into `move_cards`'s tableau-destination branch. Closes the bug where a player could lift an arbitrary multi-card selection and drop it as long as the bottom landed legally. One focused test (single-card / valid-run / same-colour / rank-gap). |
+| Deal-tween leak (#4) | `3eabc14` | `handle_new_game` now snaps every existing card sprite to the stock pile's position before writing `StateChangedEvent`. The downstream slide tween in `card_plugin` reads the stock position as its source, so all 52 cards animate from a single point — reads as "dealing from the deck" with no information leak. Gated on `Option<Res<LayoutResource>>` for headless tests. |
+| Softlock detection (#2) | `2716472` | `has_legal_moves` rewritten: replaces the early-return-on-non-empty-stock heuristic with a single pass over every card that could ever become a move source (every stock card, every waste card, the face-up top of every tableau column). Each is checked against every foundation and every tableau. Returns `true` only if some card anywhere can land somewhere — otherwise the player is genuinely stuck no matter how many recycles. Fresh-game test renamed; new test reproduces Quat's exact case (foundation 0 at 10, stock holds Hearts 2–5, no legal landing). |
+| End-game screen (#3) | — | Resolved as downstream of #2. Verified `GameOverScreen` (game_plugin.rs:636) shows "No more moves available" + final score + Undo + New Game buttons; `WinSummaryOverlay` (win_summary_plugin.rs) shows the breakdown + Play Again. Both pre-existed; the softlock path just wasn't being reached. |
+
+### Investigation findings
+
+**Solver / unwinnable-deals decision (Quat report):** still open — needs your call. Three options Quat outlined: (a) accept some deals are unwinnable, (b) run a solver at deal-time and only ship winnable layouts, (c) offer a "winnable deals only" mode. (b) is the modern-Solitaire standard but adds a dependency or hand-rolled solver (~500–1500 LOC). (c) is the lightest middle ground — keep classic deals available, add a Settings toggle. Recommendation: defer until other UX work settles; doesn't block any release.
+
+**Dependency duplicates (Quat report — 1014 deps):** the biggest single bloat is the audio stack split. Bevy's default features pull `bevy_audio → rodio → cpal 0.15 + alsa 0.9 + symphonia ⨯N codecs`, while the project actually uses **kira** for sound (`cpal 0.17 + alsa 0.10`). Disabling Bevy's default `bevy_audio` feature would eliminate 20+ transitive crates including the rodio + symphonia chain. Other duplicates are minor (bitflags 1.x via `png` is build-tooling only; multiple hashbrown majors are common in the Bevy/wgpu ecosystem and not actionable). Recommendation: a one-line `default-features = false` swap on the workspace `bevy =` line, then re-enable explicitly the features the engine uses (`render`, `bevy_winit`, `2d`, `bevy_window`, `png`, `bevy_text`, `bevy_ui`, `bevy_log`, `bevy_asset`, `default_font`, `bevy_state`, `webgpu`/`webgl2` if targeting wasm). Worth ~50 fewer crates compiled. Defer until the active feature work settles so churn doesn't conflict.
+
 ## Open punch list — release prep
 
-1. **Push** the unpushed commits to origin (5 commits now: 17f9b51, 13dd44b, ddc8f27, 7ed4f2c, a0fc0d2, b37f0cb, plus the impending doc commit).
+1. **Push** the unpushed feature commits to origin (5 still unpushed: `b37f0cb`, `a0fc0d2`, `7ed4f2c`, `ddc8f27`, `13dd44b`/`17f9b51` — those last two were on the v0.13.0 round, never pushed; verify with `git log --oneline origin/master..HEAD` after committing replay).
-2. **Tag v0.13.0** at the doc-commit HEAD.
+2. **Roll v0.13.0 + replay + bug fixes into v0.14.0** rather than tagging two close releases. The bug fixes alone aren't a feature release; bundle them with the replay feature when it lands.
 3. **Desktop packaging** per `ARCHITECTURE.md §17`. The Arch PKGBUILD exists in `/home/manage/solitaire-quest-pkgbuild/` (separate repo). Pending: app icon, macOS `.icns` + notarisation cert, Windows `.ico` + Authenticode cert, AppImage recipe.
+4. **Smoke-test the bug fixes** on the alex machine after pulling: confirm (a) tableau-to-tableau invalid-stack moves are now rejected, (b) the new-game deal animates from a single deck position with no per-card origin leak, (c) softlock with unplayable stock now spawns the GameOverScreen.
 
 ## Open punch list — UX iteration (next-round candidates)
 
-The v0.13.0 list is exhausted. Fresh candidates for a future round:
+Several v0.13.0-era candidates have already shipped to master since the v0.13.0 doc commit: **daily-challenge calendar** (`1a10476`), **card-art thumbnails in the theme picker** (`ba527de`), **auto-save in Time Attack** (`0001432`). Replay is **WIP in the working tree** — `solitaire_data/src/replay.rs` plus modifications across stats/settings/win-summary plugins. Not yet committed.
+
+Fresh candidates not yet started:
 
-- **In-game daily-challenge calendar** — currently the daily challenge fires once on launch; a Settings or Profile-side calendar showing past days' completion / streak status would make the progression visible.
-- **Card-art preview in the theme picker** — Settings → Cosmetic shows theme name only; rendering the theme's Ace-of-Spades + back side-by-side as a thumbnail would make picking faster.
 - **Per-mode high-score readout** in the Stats screen. Currently lifetime stats roll all modes together.
-- **Auto-save in-progress games** in Zen / Time Attack so players who close the window mid-session don't lose their state.
+- **Auto-save Zen mode** alongside Time Attack so close-mid-session resumes work in both.
-- **Configurable scoring weights** for the curious — Settings → Gameplay slider for time-bonus magnitude. Cosmetic but power-user appealing.
+- **Configurable scoring weights** — Settings → Gameplay slider for time-bonus magnitude. Cosmetic but power-user appealing.
-- **Replay a winning game** — record the seed + move list at win time and offer "watch replay" from the Stats screen.
+- **Solver-at-deal toggle** (Quat's investigation #1, deferred): per the recommendation in the session-8 findings, add a Settings toggle "Winnable deals only" rather than baking solver-only into all deals. Lightest middle ground.
+- **Disable Bevy's default audio feature** (Quat's investigation #2, deferred) to drop ~50 transitive crates. One-line workspace edit then re-enable engine features explicitly. Defer until active feature work settles.
 
 ## Card-theme system (CARD_PLAN.md, fully shipped)
 
@@ -69,17 +88,22 @@ Seven phases landed across `b8fb3fb` → `924a1e2` in v0.11.0; v0.13.0's `7ed4f2
 You are a senior Rust + Bevy developer working on Solitaire Quest.
 Working directory: <Rusty_Solitaire clone path on this machine — local
 directory may still be named Rusty_Solitare from earlier; that's fine>.
-Branch: master. Direction is OPEN — three UX iteration rounds shipped
+Branch: master. Direction is OPEN — Quat's smoke-test bug round
-and v0.13.0 is ready to tag.
+landed (3 fixes pushed, 1 resolved as downstream); replay feature is
+WIP in the working tree.
 
-State: HEAD at the doc-commit closing session 7 round 3. Local master
+State: origin/master at 2716472 (Quat's softlock fix). Working tree
-is several commits ahead of origin and unpushed. Working tree clean
+has uncommitted replay-feature WIP across solitaire_data,
-apart from untracked CARD_PLAN.md (intentional).
+solitaire_engine, solitaire_sync — `solitaire_data/src/replay.rs` is
+new. Plus untracked CARD_PLAN.md (intentional). Five feature commits
+from v0.13.0 round are unpushed (b37f0cb, a0fc0d2, 7ed4f2c, ddc8f27,
+plus the v0.13.0 doc commits) — verify with
+`git log --oneline origin/master..HEAD`.
 Build: cargo clippy --workspace --all-targets -- -D warnings clean.
-Tests: 1053 passed / 0 failed.
+Tests: 1126 passed / 0 failed (includes Quat's softlock regression).
 
 READ FIRST (in order, before doing anything):
-  1. SESSION_HANDOFF.md  — full state, session 7 changelog, punch list
+  1. SESSION_HANDOFF.md  — session 8 changelog + punch list
   2. CHANGELOG.md        — release-by-release record
   3. CLAUDE.md           — hard rules (UI-first, no panics, etc.)
   4. ARCHITECTURE.md     — crate responsibilities + data flow
@@ -88,22 +112,28 @@ READ FIRST (in order, before doing anything):
                            may be missing on a fresh machine)
 
 DECISION TO ASK THE PLAYER FIRST:
-  A. Push and cut v0.13.0 now.
+  A. Finish the replay-feature WIP, commit, then bundle everything
-  B. Smoke-test the new feel layer first (theme-aware backs, keyboard
+     (replay + v0.13.0 round + Quat fixes) into v0.14.0.
-     drag, right-click radial, score-breakdown reveal, streak fire,
+  B. Smoke-test the bug fixes on alex first to confirm Quat's three
-     tooltip-delay slider), then tag.
+     issues are resolved in real gameplay.
-  C. Skip the tag for another iteration round — see "next-round
+  C. Take the deferred Bevy-audio-feature trim (Quat investigation
-     candidates" in SESSION_HANDOFF for fresh ideas.
+     #2): drop default-features and re-enable explicitly. Worth ~50
-  D. Take the deferred desktop-packaging item (needs artwork +
+     fewer crates.
+  D. Take the deferred solver toggle (Quat investigation #1): add
+     "Winnable deals only" Settings toggle.
+  E. Pick from the remaining "next-round candidates" in this doc.
+  F. Take the deferred desktop-packaging item (needs artwork +
      signing certs from the user).
 
 WORKFLOW NOTES:
   - Commits use:
       git -c user.name=funman300 -c user.email=root@vscode.infinity \
           commit -m "..."
+  - When attributing playtester feedback in commits/docs, use "Quat"
+    not "Rhys" (saved feedback memory).
   - Sub-agents stage + verify only; orchestrator commits.
   - Every commit must pass build / clippy / test before pushing.
   - Push to GitHub (origin) — that is the canonical remote.
 
-OPEN AT THE START: ask which of A / B / C / D. Don't pick unilaterally.
+OPEN AT THE START: ask which of A–F. Don't pick unilaterally.
 ```