test(732): re-measure the whole table after adding three clauses and their tests

Thirty rows, all red, eleven reddening more than one fixture. One row moved: dropping HaloColor from
FitTextBlock now also reddens the new blur test, because that test declares a halo colour too.

Added a note that rows are written per clause rather than per block. Block-level rows are what hid
the per-field gap a cold review found - a row naming the whole style-merge block read as covering it,
while HaloBlur inside that block had no reachable test.

Refs: #732

docs/graphics-elements.md

@@ -163,6 +163,9 @@ observable); the absent-target early return and the temp-file existence check in
 `UpgradeUnmodifiedTemplate` (both behaviourally redundant — the first re-raises as a caught
 `IOException`, the second guards a delete that is already a no-op).
 
+Rows are written per clause, not per block: a row naming a whole `if` or a whole style-merge block
+hides which individual fields inside it are actually reachable from a test.
+
 | # | Clause mutated | Reddens (measured) |
 |---|---|---|
 | 1 | DrawBackgroundBox returns immediately | `An_Oversized_Border_Is_Clamped_And_Does_Not_Flood_The_Element`<br>`Background_Color_Fills_The_Box`<br>`Background_Opacity_Percent_Scales_The_Alpha`<br>`Background_Padding_Actually_Insets_The_Text`<br>`Border_Color_Draws_A_Border_Distinct_From_The_Fill`<br>`Border_Color_Without_An_Explicit_Width_Draws_A_Hairline`<br>`Corner_Radius_Rounds_The_Corner_Away` |
@@ -179,7 +182,7 @@ observable); the absent-target early return and the temp-file existence check in
 | 12 | create-time AttachDefaultGraphicsElements call removed | `Attaches_The_Built_In_Element_To_A_New_Channel` |
 | 13 | HLS-Direct skip removed from the create path | `Leaves_An_Hls_Direct_Channel_Alone_Because_Nothing_Can_Render_There` |
 | 14 | upgrade no longer catches filesystem exceptions | `A_Failed_Replace_After_A_Complete_Temp_Write_Leaves_The_Original_Intact`<br>`A_Failed_Write_Leaves_The_Original_Template_Intact`<br>`A_Read_Failure_On_The_Template_Does_Not_Fail_Startup`<br>`An_Unwritable_Template_Does_Not_Fail_Startup` |
-| 15 | FitTextBlock drops HaloColor again | `The_Scale_Path_Preserves_The_Halo` |
+| 15 | FitTextBlock drops HaloColor again | `The_Scale_Path_Preserves_Halo_Blur`<br>`The_Scale_Path_Preserves_The_Halo` |
 | 16 | unrounded inset subtracted from the budget | `Fractional_Padding_Still_Respects_Width_Percent` |
 | 17 | inset clamp removed | `An_Oversized_Padding_Is_Clamped_To_The_Largest_That_Fits` |
 | 18 | Kind == Text filter dropped from the lookup | `Ignores_A_Same_Named_Element_Of_A_Different_Kind` |
@@ -191,4 +194,7 @@ observable); the absent-target early return and the temp-file existence check in
 | 24 | marker written even with nothing resolved | `Stays_Armed_When_There_Is_No_Built_In_Element_To_Attach`<br>`While_Armed_A_Restored_Element_Is_Attached_To_Every_Eligible_Channel` |
 | 25 | the atomic replace becomes a non-atomic copy | `A_Failed_Replace_After_A_Complete_Temp_Write_Leaves_The_Original_Intact` |
 | 26 | the frame cap on the inset is disarmed | `Non_Finite_And_Absurd_Box_Values_Do_Not_Corrupt_The_Geometry`<br>`The_Inset_Is_Capped_Against_The_Frame_Even_With_No_Width_Percent` |
-| 27 | per-style halo overrides dropped from the style merge | `A_Non_Base_Style_Uses_Its_Own_Halo_Not_The_Base_Styles` |
+| 27 | per-style halo overrides dropped from the style merge | `A_Non_Base_Style_Uses_Its_Own_Halo_Blur`<br>`A_Non_Base_Style_Uses_Its_Own_Halo_Not_The_Base_Styles` |
+| 28 | FitTextBlock drops HaloBlur from the rebuilt style | `The_Scale_Path_Preserves_Halo_Blur` |
+| 29 | FitTextBlock drops LineHeight from the rebuilt style | `The_Scale_Path_Preserves_Line_Height` |
+| 30 | per-style halo_blur override dropped from the style merge | `A_Non_Base_Style_Uses_Its_Own_Halo_Blur` |