docs: cut v0.21.6 — Move Log panel + scrub-UX polish
Patch release rolling up six post-v0.21.5 commits under the through-line "Move Log panel + scrub-UX polish": -d3cb1a5: HC-mode coverage for scrub track + notches -2e25476: continuous scrub on key-held ← / → at 100ms cadence -d6f32d3: Move Log panel + active row (header + format helpers) -140251b: 2 prev rows above active -e7345ae: active-row highlight with ACCENT_PRIMARY background -4437a1a: 2 next rows below active The Move Log panel is the first replay-overlay surface that isn't attached to the banner — it lives at a separate screen anchor (bottom: 0) with its own spawn/despawn lifecycle. Establishes the multi-anchor replay UI pattern that the remaining B-2 sub-piece (mini-tableau preview) will inherit. Panel grows 56 → 84 → 112 px across the four move-log commits. HighContrastBackground primitive lifted to ui_theme parallel to HighContrastBorder; settings_plugin gains update_high_contrast_backgrounds for the BackgroundColor repaint cycle. Continuous scrub uses a per-key accumulator resource (ReplayScrubKeyHold) gated on SCRUB_REPEAT_INTERVAL_SECS (0.1s). Tests: 1250 → 1273 (+23 net new). Clippy clean. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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## [Unreleased]
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No threads in flight. v0.21.5 cut on 2026-05-08; CHANGELOG accumulates
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No threads in flight. v0.21.6 cut on 2026-05-08; CHANGELOG accumulates
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the next cycle here.
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## [0.21.6] — 2026-05-08
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Patch release for the post-v0.21.5 work. Through-line:
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**Move Log panel + scrub-UX polish**. v0.21.5 closed out the
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keyboard-accelerator surface (Space / Esc / ← / →) and the
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keybind footer; v0.21.6 builds on that with two parallel
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threads — accessibility + scrub-on-hold polish for the v0.21.5
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surfaces, plus a brand-new Move Log panel anchored to the
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viewport's bottom edge that gives players a 5-row recent-and-
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upcoming move history alongside the existing top-edge banner.
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The Move Log panel is the first replay-overlay surface that
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*isn't* attached to the banner — it lives at a separate screen
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anchor (bottom: 0) with its own spawn/despawn lifecycle.
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Establishes the pattern for "multi-anchor replay UI" that the
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remaining B-2 sub-piece (mini-tableau preview) will inherit.
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### Added
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- **HC-mode coverage for the scrub track + quarter-mark notch
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ticks** (`d3cb1a5`). Adds parallel primitive
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`HighContrastBackground` to `ui_theme` and a paint system
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`update_high_contrast_backgrounds` in `settings_plugin` that
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mirrors the existing border-marker pattern but targets
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`BackgroundColor` instead of `BorderColor`. Tags the 1 px
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scrub track Node and all five quarter-mark notch ticks so
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they bump from `BORDER_SUBTLE` (`#505050`) →
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`BORDER_SUBTLE_HC` (`#a0a0a0`) under HC mode. Scrub fill
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(`ACCENT_PRIMARY`) and WIN MOVE marker (`STATE_SUCCESS`)
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don't get the marker — accent and state colours are already
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saturated and don't need an HC luminance variant.
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- **Continuous scrub on key-held arrow keys** (`2e25476`).
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Holding ← or → triggers continuous step at 100 ms cadence
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(10 steps/sec) — matches the mockup's `[← →] scrub`
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terminology while keeping single-press = single-step
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semantics. Per-key accumulators in a new
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`ReplayScrubKeyHold` resource; `just_pressed` events bypass
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the accumulator and fire immediately. Release resets to 0
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so the next fresh press fires immediately rather than at
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half-interval.
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- **Move Log panel** (`d6f32d3` + `140251b` + `e7345ae` +
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`4437a1a`). New bottom-edge UI panel showing a 5-row window
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onto recent + upcoming moves: 2 prev rows above the active
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row + active row highlighted in `ACCENT_PRIMARY` + 2 next
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rows below. Header reads `▌ MOVE LOG · N/M` (or
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`▌ MOVE LOG · COMPLETE` when finished). Active row carries
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a `▶` focus prefix and `TEXT_PRIMARY_HC` text colour for
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legible contrast against the brick-red highlight. Prev /
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next rows render in `TEXT_SECONDARY` so the active row
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stays the focal point.
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- Sibling-of-banner pattern (separate root entity anchored
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at viewport bottom, not a banner child) — same
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spawn/despawn lifecycle as `ReplayFloatingProgressChip`,
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different screen anchor.
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- Five pure helpers handle the formatting:
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`format_pile`, `format_move_body`,
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`format_move_log_header`, `format_kth_recent_row` (active
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+ prev), `format_kth_next_row` (next). 1-indexed display
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numbers throughout (`Foundation(2)` reads as "foundation
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3" rather than the enum's 0-index).
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- Panel grows from 56 → 84 → 112 px across the four
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move-log commits. `MOVE_LOG_PREV_ROWS` and
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`MOVE_LOG_NEXT_ROWS` constants (both = 2) parameterise
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the row count; `format_kth_recent_row` and
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`format_kth_next_row` return empty for out-of-range k so
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panels gracefully under-fill at the start (cursor=1) and
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end (cursor=N-1) of a replay.
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- HC marker on the panel's top border so the 1 px edge
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bumps under HC mode (same pattern as the keybind footer).
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### Changed
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- **`react_to_state_change` despawns the Move Log panel** on
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`Playing → Inactive` alongside the banner root and floating
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progress chip. Third query in the same defer-and-despawn
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cycle.
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- **Move Log panel height grew 56 → 84 → 112 px** across the
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prev-rows and next-rows commits. The panel is sized to fit
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the chosen row count + header + padding; tunable via the
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`MOVE_LOG_PANEL_HEIGHT` const.
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- **`format_active_move_row` now prefixes the `▶` focus
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marker** (`e7345ae`). Wraps `format_kth_recent_row(state, 1)`
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and prepends the prefix when the body is non-empty. Empty
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case still returns empty — cursor=0 doesn't paint a stray
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`▶` on an otherwise-empty row.
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### Documentation
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- `SESSION_HANDOFF.md` refreshed twice this cycle — once
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recording the HC paint + continuous-scrub polish, then
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again as the Move Log arc shipped commit-by-commit. The
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Resume menu's B option now traces the full arc:
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notches → labels → footer → ESC → HC → arrow keys →
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HC paint → continuous scrub → move log.
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### Stats
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- **1273 passing tests / 0 failing** across the workspace
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(net +23 from v0.21.5's 1250 baseline):
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- 2 from `d3cb1a5` (HC marker on track + notches).
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- 2 from `2e25476` (continuous-scrub repeat-while-held +
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release-resets-accumulator).
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- 8 from `d6f32d3` (move-log panel init + 5 helpers + 3
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spawn / lifecycle scenarios).
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- 4 from `140251b` (prev rows: helper k coverage + spawn
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cardinality + spawn texts + repaint on cursor advance).
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- 3 from `e7345ae` (active row highlight: wrapper bg +
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text colour + focus prefix + cursor=0 stays empty).
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- 4 from `4437a1a` (next rows: helper k coverage + spawn
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cardinality + spawn texts + under-fill at replay end).
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- Clippy clean across the workspace.
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## [0.21.5] — 2026-05-08
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Patch release for the post-v0.21.4 work. One through-line:
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