[nickyyOO]

Before

The help window and tutorial records were read through loose offsets, and the extern move in #270 left 992 headers that hold one prototype each (one per function file), so a caller of three decoder functions included three headers.

After

• Help records (Purab Shah, from chore: clarify help message and usage record types #271): named types for the help window, message entries and tutorial records, a layout check in src/check/help_window_layout_check.c and docs/game/help-messages.md.
• Prototype headers: the single-function headers of each source folder are now one header named after the folder, e.g. src/audio/decoder/*.c → include/rnc/audio/decoder.h (152 folder headers instead of 967 files; 531 files include fewer headers). Type headers are unchanged.
• 21 headers keep their own file: their prototype differs from a caller's local declaration (argument-order and void-return fakematches, libc helpers), or a level copy declares the same name with another label (blarg_helicopter_update, gadgebot_update, update_moby_suck_cannon_state in l12/l18 class tables).
• src/camera/update_camera.c calls update_all_cameras through its header instead of the func_001EC420 alias (same address).
• src/README states the one-header-per-folder rule.

Verification

• make elf ends with PASS: reconstructed boot ELF matches retail
• make overlays ends with PASS; all 1992 overlay objects compare equal to the build before the header change
• make check passes (test_public_tools OK, check-cleanup: no new problems)
• clang -fsyntax-only (with and without -DNON_MATCHING) gains no undeclared, conflicting, asm-label or redefinition errors in any src/ file
• Changed C passes scripts/format.py --check

[github-actions]

Decompilation progress

	C_EXACT	Change	Matched bytes	Functions	C_FUZZY
All code	100.00 %	—	3,547,932 / 3,547,932 B (—)	4,244 / 4,244 (—)	100.00 %
Boot executable	100.00 %	—	354,504 / 354,504 B (—)	1,230 / 1,230 (—)	100.00 %
Game	100.00 %	—	264,872 / 264,872 B (—)	850 / 850 (—)	100.00 %
SDK	100.00 %	—	89,632 / 89,632 B (—)	380 / 380 (—)	100.00 %
Level overlays	100.00 %	—	3,193,428 / 3,193,428 B (—)	3,014 / 3,014 (—)	100.00 %
Shared level code	100.00 %	—	1,130,492 / 1,130,492 B (—)	1,583 / 1,583 (—)	100.00 %
Per-level code	100.00 %	—	2,062,936 / 2,062,936 B (—)	1,431 / 1,431 (—)	100.00 %

	Data in C	Change	Matched bytes
All data	62.81 %	—	7,809,078 / 12,433,372 B (—)
Boot executable	26.98 %	—	188,645 / 699,136 B (—)
Level overlays	64.94 %	—	7,620,433 / 11,734,236 B (—)

No function changed its match state compared with main (9071100).

_{Compared with main (9071100). C_FUZZY uses main's last measurement.}