Expand dat coverage and verify types with objdiff samples

[ribbanya]

See tools/dat-cli/README.md.

The walk now reads every archive, including the packed Pl??AJ.dat animation files, and types 99.5% of their public symbols. Symbols the loaders don't record, because their names are built at runtime, are typed by name patterns in config/GALE01/dat_symbols.txt (fighter animations, the HSD exporter's *_joint/*_matanim_joint/... names, textures and palettes as byte arrays, SISLib text, stage parameters, scenes and Kirby's copy abilities). New annotations cover what C types can't: DAT_NULLTERM lists (also on typedefs, for nested ones like the envelope lists), DAT_SCRIPT command streams (fighter action scripts, with lengths from the game's own table), DAT_EXTENT on pointers, and DAT_TYPE on typedefs.

melee-dat symbols coverage reports how many relocations the walk explains (91.5%) and classifies the rest: gaps where a type is missing or wrong, data trailing a typed object where nothing points, and data nothing references at all. It can group them by archive, by the object they follow or by untyped field, and writes JSON shaped like objdiff's report.json or Markdown tables like this one:

Family	Archives	Publics	Typed	Relocations	Explained	Gap	Trailing	Unreferenced	Reachable
Db	1/1	1	100.00%	854	0.70%	0	848	0	0.70%
Ef	35/36	36	97.22%	16693	0.31%	2	16521	118	0.31%
Gm	46/47	97	98.97%	30755	50.69%	283	14883	0	50.69%
Gr	71/71	4260	98.99%	216551	71.95%	2306	51885	6543	74.20%
If	7/7	18	100.00%	7184	81.92%	0	1299	0	81.92%
Ir	6/6	126	100.00%	4656	65.31%	0	1615	0	65.31%
It	1/1	1	100.00%	43705	89.11%	2	1926	2830	95.28%
Lb	6/6	12	91.67%	186	5.91%	2	173	0	5.91%
Mn	5/5	350	98.29%	33176	93.11%	8	2279	0	93.11%
Nt	4/4	4	100.00%	908	82.82%	0	156	0	82.82%
Pd	1/1	1	100.00%	1	100.00%	0	0	0	100.00%
Pl	6485/6485	6623	100.00%	1306218	97.35%	661	24392	9501	98.07%
Sd	15/15	15	100.00%	7332	100.00%	0	0	0	100.00%
Sm	1/1	1	100.00%	4198	0.24%	0	4188	0	0.24%
Tm	0/1	3	0.00%	0	100.00%	0	0	0	100.00%
Ty	352/352	492	100.00%	95067	96.47%	74	1323	1961	98.50%
Vi	11/11	20	100.00%	5563	26.53%	0	4087	0	26.53%
Total	7047/7050	12060	99.54%	1773047	91.55%	3338	125575	20953	92.64%

melee-dat samples checks the types themselves. It picks one instance of each type, and of each variant its tagged unions choose, then writes the instance's bytes as a target object and C initializers generated from the current types, compiled with the game's MWCC command. objdiff compares them, so a pointer typed as an integer, data in padding or a layout MWCC disagrees with shows up as a mismatch. Everything is generated under build/GALE01/dat, which is an objdiff project. All HSD and SDK samples match; one item type doesn't yet.

The DWARF build now compiles aurora's headers in their console layout rather than TARGET_PC, which had made GXBool an int and grown GXTexObj and GXTlutObj. dat_macros.h fills in the GX vertex functions aurora's console branch lacks, until they're upstreamed.

Fixed along the way: stage touch-line callbacks return hitbox data (lbColl_80008D30_arg1), not DynamicsDesc; Kirby's copy table is one entry per FighterKind, so every hats[] read was a fighter off, and each copy now has a struct; ftData_x20.x0 is the shield's root joint; FigaTrack has a byte at +7; HSD_RObjDesc_u lists a pointer member first so C initializers can hold every variant.