fix retained glyph bottom clipping

docs/engine-re.md

@@ -2894,6 +2894,16 @@ The shipped effect profiles use only modes 1 and 3:
   `360 / (sqrt(effect_x²+effect_y²)*8)`, blits the effect-colored glyph at every rounded offset, then
   draws the primary glyph. All 164 paired sites use `(1,1)`, producing the normal one-pixel outline.
 
+**Measured cell versus raster ink (2026-07-30).** `adv_text_build_glyph_records@0x4576c0` stores
+the `GetTextExtentPoint32A` measured cell edges in each retained record, and
+`adv_text_publish_next_glyph@0x451220` uses those edges when it binds the native object.
+`text_raster_string_cached@0x45b600`, however, composites the complete `GetGlyphOutlineA` black-box
+bitmap and effect copies into the shared layout surface. Direct 24-pixel bold Mincho probes show several
+ordinary Japanese glyphs reaching below the 24-pixel measured cell even before the mode-3 `(1,1)` outline.
+Thus the record is a layout/publication cell, not a guaranteed ink bounding box. The port preserves that
+native record and derives a separate transient vertical publication crop from mask origin/height and effect
+offsets; its horizontal crop remains the measured cell to avoid exposing the next glyph during timed reveal.
+
 The ordinary ADV preset is therefore 24-pixel `ＭＳ 明朝`, weight 700, white fill, mode-3 `(1,1)` outline
 in `0x606060`, with 8 pixels of line leading. The small menu-description preset is 16-pixel
 `ＭＳ ゴシック`, weight 0, white fill, mode 1 with zero displacement, and 9 pixels of leading.

docs/phase-a-slice-plan.md

@@ -3674,6 +3674,15 @@ surface's z-order, alpha, tint, fade, transform, clipping, capture, and lifetime
 Validation: engine **580/580**, zero-warning Godot build, and threaded `SELFTEST OK` in both forced
 `portable-godot-textserver` and forced `windows-gdi-gray4` modes.
 
+**Bottom-edge clipping follow-up (2026-07-30):** retained publication originally reused the native
+measured-cell rectangle as its exact source crop. Direct GDI probing confirmed that the glyph black-box
+bitmap, plus the mode-3 outline, can extend below that cell even though the pixels are present in the
+layout surface. The native `AdvRetainedGlyphRecord` remains unchanged for layout and reconstruction; each
+transient placement now carries a separate vertically ink-safe publication rectangle. Horizontal edges
+remain cell-bounded so timed reveal cannot expose a neighboring glyph. Synthetic compositor/publication
+regressions pass, the Godot build is clean, and forced exact and portable self-tests both report
+`SELFTEST OK`.
+
 ## Persistence native-format reconnaissance complete (2026-07-24)
 
 The deferred save/profile ownership question now has a compatibility-mode answer. The remaining native

docs/remake-architecture-and-roadmap.md

@@ -627,7 +627,10 @@ primitive, which cannot be made equivalent by choosing another embolden constant
    per-run origins, partial erase/republication, suspension, measured cursor handoff, reset, and
    reconstruction. The synthesized Godot VM self-test exercises timed exact reveal and reports
    `live-adv-text=retained-glyphs`; real GPU captures of SC0000 pages 1 and 7 confirm ordinary and voiced
-   dialogue placement/wrapping alongside the immediate speaker-name surface.
+   dialogue placement/wrapping alongside the immediate speaker-name surface. A 2026-07-30 clipping
+   follow-up keeps those native measured-cell records intact but gives transient placements a separate
+   vertically ink-safe source crop, because backend glyph black boxes and mode-3 outlines can extend below
+   the measured cell; horizontal crops remain cell-bounded to preserve reveal isolation.
 6. **Migrate History and the ADV wait indicator through the same retained path. — Completed
    2026-07-30.** Op `0x1d1` now rasterizes each HISTORY row into its target layout surface and publishes its
    native glyph interval through ordinary `GfxState` bindings. Row reset, wheel redraw, the broad native exit
@@ -645,7 +648,8 @@ primitive, which cannot be made equivalent by choosing another embolden constant
    sizes. `auto` selects exact GDI when its ACP-932 gate passes and otherwise selects the explicitly
    non-pixel-exact Unicode backend; development runs can force either with `--text-backend`. Both modes pass
    the same immediate/live/History retained-glyph self-test. Gameplay `Label` pools and surface-text overlay
-   projection are removed, so text always participates in the ordinary surface compositor.
+   projection are removed, so text always participates in the ordinary surface compositor. Publication uses
+   the transient ink-safe crop established in step 5 in both backends.
 
 **Acceptance gates:**