✨ Add TBytes32Stack to LibTransient (issue #1185)

[BhariGowda]

Closes #1185

Adds TBytes32Stack a transient storage value stack for bytes32.

Unlike TStack (which generates typed pointers), this stores values directly.

API

• tBytes32Stack(bytes32/uint256) → pointer
• push(ptr, bytes32) store value
• pop(ptr) → remove and return top (reverts if empty)
• top(ptr) → peek top (reverts if empty)
• top(ptr, uint256 i) → i-th from top, 0=top
• size(ptr) → element count
• clear(ptr) → reset stack

Design

• Pure assembly, TSTORE/TLOAD
• Reuses existing StackIsEmpty error
• Element stride: _STACK_BASE_SALT * slot + ((i+1) << 32)
• clear() zeroes size only — push always writes before read, no stale values

Tests

7 new tests concrete, fuzz, collision, 3 revert cases
Run: FOUNDRY_PROFILE=post_osaka forge test --match-path test/LibTransient.t.sol
29 passed, 0 failed

[github-actions]

Gas Snapshot Comparison Report

Generated at commit : a723db1, Compared to commit : ab96a83

Contract Name	Test Name	Main Gas	PR Gas	Diff
LibRLPWithCLZTest	testComputeAddressForLargeNonces()	1750	-	-
	testComputeAddressForSmallNonces()	997	-	-
	testComputeAddressOriginalForLargeNonces()	3495	-	-
	testComputeAddressOriginalForSmallNonces()	2088	-	-
	testRLPEncodeBytes()	250090	-	-
	testRLPEncodeBytes2()	155904	-	-
	testRLPEncodeList()	735942	-	-
	testRLPEncodeList2()	810708	-	-
	testRLPEncodeListEdgeCases()	1807743	-	-
	testRLPEncodeStringEdgeCases()	20424	-	-
	testRLPEncodeUint()	1175570	-	-
	testRLPPUint256()	363834	-	-
	test__codesize()	18292	-	-
LibTransientTest	testEmptyStackPopReverts()	3908	3942	34
	testEmptyStackTopReverts()	3879	3946	67
	testRegistryAB()	429436	429381	-55
	testRegistryNotDeployed()	72369	72391	22
	testSetAndGetBytesTransient()	51071	51115	44
	testStackPlacePopBytes()	37865	37909	44
	testUint256IncDecTransient()	123992	124436	444
	test__codesize()	23261	25345	2084
	testBytes32StackPushPop()	-	4544	-
	testEmptyBytes32StackPopReverts()	-	3933	-
	testEmptyBytes32StackTopIndexReverts()	-	4362	-
	testEmptyBytes32StackTopReverts()	-	3939	-