CI: speed up formatting and check symbol regressions against the base

[fjooord]

1. Check All Formatting in One Container

Run clang-format 21 across all tracked source files in one Docker container. No automatic edits or custom formatting helper.

• Previous CI: 9m23s, starting a container per file.
• Local check: 15.7s for 1,475 files, with the image cached. Remote timing pending.
• Includes the whitespace-only fix in include/JSystem/JAudio/JALibrary/JALList.hpp, the only file failing formatting. The full-tree check now passes locally.

2. Fail on New Symbol Defects

#161 compiled and generated its report, then failed symbol-map validation. Compare against a separately built upstream base: inherited defects become warnings; new missing symbols, ordering errors, or incorrect linkage fail CI.

Previously empty objects get no exemptions. If the base object has no function symbols, its first implementation must pass strict validation.

Compiler errors and missing validation inputs still fail. Standalone validation stays strict. This does not implement missing functions or repair existing symbol defects.

Validation: 15 local checks pass, including empty-baseline behavior. No test files or test steps are added to the PR. Game implementation changes stay in #161.

[fjooord]

Included the whitespace-only fix in include/JSystem/JAudio/JALibrary/JALList.hpp, the only file failing the full-tree formatting check.

The exact workflow command now passes locally across all 1,475 tracked source files in one Docker container, taking 15.7 seconds with the image cached. Including this fix should let the full-tree formatting job pass when this PR is merged. Remote CI still needs to confirm; this formatting result does not establish build success.

[decomp-dev]

Report for GMSJ01 (aeebbbf - 8bfaa54)

📉 Matched code: 39.16% (-0.09%, -3304 bytes)
📉 Matched data: 56.07% (-0.23%, -1480 bytes)

🥀 5 broken matches

Unit	Item	Bytes	Before	After
mario/Enemy/BossHanachanSave	TBossHanachanChangeSaveParams::TBossHanachanChangeSaveParams(const char*)	-1608	100.00%	0.00%
mario/Enemy/BossHanachanSave	TBossHanachanCommonSaveParams::TBossHanachanCommonSaveParams(const char*)	-1408	100.00%	0.00%
mario/Enemy/BossHanachanSave	.rodata	-1328	100.00%	0.00%
mario/Enemy/BossHanachanSave	.sdata2	-152	100.00%	0.00%
mario/MoveBG/MapObjFloat	TMapObjFloatOnSea::initMapObj()	-8	100.00%	97.57%

📉 2 regressions in unmatched items

Unit	Item	Bytes	Before	After
mario/MarioUtil/EffectUtil	SMS_EmitSinkInPollutionEffect(const JGeometry::TVec3<float>&, const JGeometry::TVec3<float>&, bool)	-10	98.75%	96.66%
mario/MoveBG/MapObjDolpic	TBellDolpic::ring(const JGeometry::TVec3<float>&)	-1	99.19%	98.83%