refactor(offchain): consume canonical BalanceTracker + MechMarketplace, bump OA 0.21.26 #3544

Job	Run time
lock_check (windows-2025, 3.10)	32s
copyright_and_dependencies_check (ubuntu-24.04, 3.10)	1m 59s
gitleaks	37s
lock_check (ubuntu-24.04, 3.10)	11s
lock_check (macos-15, 3.10)	50s
linter_checks (ubuntu-24.04, 3.10)	3m 12s
test (ubuntu-24.04, 3.14)	2m 4s
test (macos-15, 3.13)	2m 0s
test (ubuntu-24.04, 3.11)	1m 55s
test (ubuntu-24.04, 3.13)	1m 53s
test (windows-2025, 3.10)	3m 50s
test (macos-15, 3.12)	2m 1s
test (ubuntu-24.04, 3.12)	2m 7s
test (macos-15, 3.10)	2m 3s
test (ubuntu-24.04, 3.10)	2m 0s
test (macos-15, 3.11)	1m 52s
test (windows-2025, 3.11)	4m 32s
test (windows-2025, 3.14)	4m 16s
test (macos-15, 3.14)	3m 2s
test (windows-2025, 3.13)	3m 54s
test (windows-2025, 3.12)	4m 9s
coverage	1m 51s
All checks passed	2s
	50m 52s

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