fix(physics): match live tangent response transitions

Correct the common projection to spin*0.4 + normal_velocity*response_tangent and seal line/circle behavior against current Wine one-substep traces. Preserve record-two's in-response special-respawn continuation, producing the live (16698,21191)/(-302,-1809) state after publishing (17000,23000)/(0,3040), and update the readable C evidence.

Test Plan:
- bash original/tools/test_reconstructed_c.sh
- python3 original/tools/audit_reconstruction.py --require-complete
- cargo test --all-targets
- cargo clippy --all-targets --all-features -- -D warnings
- rumdl check original/C_RECONSTRUCTION_FINAL_AUDIT.md tdkpin-rs/CHANGELOG.md tdkpin-rs/RECONSTRUCTION.md tdkpin-rs/README.md
- live Wine record 2 trace: /tmp/original-special-respawn.csv
- live Wine object 155 trace: /tmp/original-circle155-after.csv
- git diff --check

original/C_RECONSTRUCTION_FINAL_AUDIT.md

@@ -82,6 +82,11 @@ Raw `1000:531e` further corrects the Pascal-order BitBlt interpretation: the
 DAT994 progress strip is drawn at `(202,328)` with height 13 and width
 `(stage-1)*7`, rather than the impossible historical 328x202 read from a
 237x13 bitmap. The focused loading-stage harness seals stages 1, 35, and 0.
+Live one-substep rail/circle probes further correct the response projection:
+the tangential delta is `normal_velocity * response_tangent`, added to retained
+`spin * 0.4`; subtracting the bare coefficient incorrectly rounded it to zero.
+The documented horizontal drain transition `(0,3015)->(-302,-1809)` and the
+ordinary circle/bumper tangent transitions seal this correction.
 
 ## Reproducible gates
 

original/FUNCTION_RECONSTRUCTION.tsv

@@ -68,7 +68,7 @@ address	raw_name	segment	body_bytes	status	reconstructed_name	module	evidence	no
 1000:c36b	FUN_1000_c36b	Code1	187	verified	tdkpin_load_ball_slot	reconstructed/tdkpin_gameplay_helpers.c	disassembly 1000:c36b-c425; SS caller-frame receiver; reconstructed/tests/test_gameplay_helpers.c	Exact unchecked uint16 slot times 4/6 addressing, slot position to global ball X/Y, velocity and auxiliary dword fields to receiver +0baa/+0bae/+0bca, six-byte Real48 copy to +0bce, overlap behavior, and six-byte cleanup are represented and tested.
 1000:c426	FUN_1000_c426	Code1	187	verified	tdkpin_save_ball_slot	reconstructed/tdkpin_gameplay_helpers.c	disassembly 1000:c426-c4e0; SS caller-frame receiver; reconstructed/tests/test_gameplay_helpers.c	Exact inverse unchecked uint16 slot times 4/6 transfer of global position, receiver velocity/auxiliary dwords and six-byte Real48 field into packed DGROUP slot arrays, overlapping out-of-range slot behavior, and six-byte cleanup are represented and tested.
 1000:c4e1	FUN_1000_c4e1	Code1	699	verified	tdkpin_apply_player_sprite_effect	reconstructed/tdkpin_player_state.c	disassembly 1000:c4e1-c79b; verified multiply/score dependencies; exact player tables and record 399a access; reconstructed/tests/test_player_state.c	Exact sprite-index dispatch 1..7, wrapping secondary-score additions 10000/20000/50000/100000/200000, unsigned-byte multiplier redraw, effect-6 multiplied transfer/reset/zero redraw, effect-7 nonzero record gate, signed-negative or unequal argument condition, receiver +be0 and global 0874 publications, and default no-op behavior are represented and branch-tested.
-1000:c79c	FUN_1000_c79c	Code1	8981	verified	tdkpin_simulate_ball_and_dispatch_collision	reconstructed/tdkpin_physics.c	disassembly 1000:c79c-eab0 and rz-ghidra stack-offset view; packed 83-byte records and exact 52-byte candidate layout; all integer/Real48/gameplay/GDI dependencies verified; reconstructed/tests/test_physics.c	Exact RETF-2 caller-frame ABI, simulation-call counter, snapshotted ball count and substep word, multiball load/save, gravity and two ordered speed clamps, previous/predicted coordinates, board-loss/layer gates, 175-record broadphase, types 1 circle, 2 segment, 3 capture/pocket, and 4 stateful trigger, subtype normal reversal, signed cross/end-point tests, contact-state sentinels, claw/target-set/sprite/score special paths, trigger 0x4000 lifecycle and random bounce, packed nearest-candidate copies, event/score dispatch, Real48 normal/tangent/spin/response/kick transform including deliberately zeroed intermediate, ball-to-ball impulse transfer, record 25/2 terminal paths, ordered velocity/position publication, dynamic-record update, swept rendering, 32-bit wrap, and Borland divide/error behavior are represented. Free integration, exact 3-4-5 clamp, circle/segment responses, four trigger/capture modes, distinct response/event/score paths, out-of-bounds, and zero-substep multiball are tested.
+1000:c79c	FUN_1000_c79c	Code1	8981	verified	tdkpin_simulate_ball_and_dispatch_collision	reconstructed/tdkpin_physics.c	disassembly 1000:c79c-eab0 and rz-ghidra stack-offset view; packed 83-byte records and exact 52-byte candidate layout; all integer/Real48/gameplay/GDI dependencies verified; reconstructed/tests/test_physics.c	Exact RETF-2 caller-frame ABI, simulation-call counter, snapshotted ball count and substep word, multiball load/save, gravity and two ordered speed clamps, previous/predicted coordinates, board-loss/layer gates, 175-record broadphase, types 1 circle, 2 segment, 3 capture/pocket, and 4 stateful trigger, subtype normal reversal, signed cross/end-point tests, contact-state sentinels, claw/target-set/sprite/score special paths, trigger 0x4000 lifecycle and random bounce, packed improving-distance copies with fixed first-slot response, event/score dispatch, Real48 normal/tangent/spin/response/kick transform including normal_velocity*tangent projection and the deliberately zeroed intermediate, capture-age-gated ball-to-ball transfer, record 25/2 terminal/special-respawn continuation paths, ordered velocity/position publication, dynamic-record update, swept rendering, 32-bit wrap, and Borland divide/error behavior are represented. Free integration, exact 3-4-5 clamp, live line/circle tangent transitions, four trigger/capture modes, two-candidate first-slot behavior, distinct response/event/score paths, out-of-bounds, and zero-substep multiball are tested.
 1000:eab1	exported_ordinal_10	Code1	4820	verified	tdkpin_timer_tick	reconstructed/tdkpin_timer_tick.c	disassembly 1000:eab1-fd84 including RETF-8 and all annotated calls; exact Real48 claw-release table; complete verified dependency closure including 1000:c79c; reconstructed/tests/test_timer_tick.c	Exact two-DWORD callback ABI with unused second argument, all nine guard conditions, busy flag, 175-record refresh, two dword counters, claw movement/release/record activation, ten exact spawn states, 175 countdowns, target rotation, multiball collapse/promotion/reset/spawn, physics gate, quotient-versus-remainder intro schedules, record/item/chase/status animations, complete 30x284 score-marquee GDI lifetime, panel frames 1..281, game initialization, flipper/message epilogue, busy clear, redundant tilt read, and tilt-counter decrement are represented and branch-/sequence-tested.
 1000:fd85	ne_program_entry	Code1	181	verified	tdkpin_ne_program_entry	reconstructed/tdkpin_program_entry.c	disassembly 1000:fd85-fe39; relocations 1669-1679; reconstructed/tests/test_program_entry.c	Exact InitTask register handoff, eight-unit initialization order, full DX:AX GetVersion store, Windows 3.10 threshold, indirect MessageBox error path, fixed application object construction, VMT +1c Run and +08 destructor calls, dispose mode zero, and unconditional Halt(0) are represented and branch-tested.
 1008:0002	FUN_1008_0002	Code2	33	verified	tdkpin_play_sound_if_not_tilted	reconstructed/tdkpin_sound.c	disassembly 1008:0002-0022; verified 1008:1131 dependency; DGROUP game-tilted byte 07c6 and sound-enabled byte 43f2; reconstructed/tests/test_sound.c	Exact Tilted==0 then Enabled!=0 short-circuit order, unchanged sound-number argument, ignored player result, two-byte Pascal cleanup, and all gate combinations are branch-tested.

original/reconstructed/tdkpin_physics.c

@@ -935,7 +935,7 @@ static void apply_collision_response(
     (void)discarded;
     discarded = (BorlandReal48){{0,0,0,0,0,0}};
 
-    projection = borland_real48_round_to_i32(borland_real48_subtract(
+    projection = borland_real48_round_to_i32(borland_real48_add(
         borland_real48_subtract(
             borland_real48_multiply(motion->spin, g_real48_point_four),
             borland_real48_divide(
@@ -943,7 +943,9 @@ static void apply_collision_response(
                     borland_i32_to_real48(absolute_wrap(projection)),
                     discarded),
                 borland_i32_to_real48(motion->speed))),
-        candidate->response_tangent));
+        borland_real48_multiply(
+            borland_i32_to_real48(candidate->normal_velocity),
+            candidate->response_tangent)));
     motion->spin = borland_real48_add(
         borland_real48_multiply(motion->spin, g_real48_point_six),
         spin_delta);

original/reconstructed/tests/test_physics.c

@@ -321,6 +321,21 @@ static void test_circle_and_segment_collisions(void)
                win16_far_add_offset(g_window, 0x0bae)) == 0);
     assert((int32_t)win16_read_u32(win16_dgroup_pointer(0x07d7)) == 100000);
 
+    prepare_fixture();
+    set_ball(100000, 100000, 0, 1000);
+    segment = base_record(2);
+    segment.point1_x_milli = 50000;
+    segment.point1_y_milli = 101000;
+    segment.point2_x_milli = 150000;
+    segment.point2_y_milli = 101000;
+    segment.response_tangent = (BorlandReal48){{0x7d,0xcd,0xcc,0xcc,0xcc,0x4c}};
+    write_record(1, &segment);
+    tdkpin_simulate_ball_and_dispatch_collision(0x0300);
+    assert((int32_t)win16_read_u32(
+               win16_far_add_offset(g_window, 0x0baa)) == -100);
+    assert((int32_t)win16_read_u32(
+               win16_far_add_offset(g_window, 0x0bae)) == 0);
+
     prepare_fixture();
     set_ball(100000, 100000, 1000, 0);
     circle = base_record(1);