refactor(offchain): consume canonical BalanceTracker + MechMarketplace, bump OA 0.21.26 #3546

Job	Run time
lock_check (windows-2025, 3.10)	28s
lock_check (ubuntu-24.04, 3.10)	14s
lock_check (macos-15, 3.10)	46s
gitleaks	44s
copyright_and_dependencies_check (ubuntu-24.04, 3.10)	1m 59s
linter_checks (ubuntu-24.04, 3.10)	3m 3s
test (ubuntu-24.04, 3.10)	2m 27s
test (ubuntu-24.04, 3.12)	1m 52s
test (ubuntu-24.04, 3.14)	2m 25s
test (macos-15, 3.10)	3m 12s
test (windows-2025, 3.10)	4m 18s
test (macos-15, 3.14)	2m 19s
test (ubuntu-24.04, 3.11)	1m 54s
test (ubuntu-24.04, 3.13)	2m 2s
test (windows-2025, 3.11)	4m 0s
test (macos-15, 3.11)	2m 23s
test (windows-2025, 3.12)	5m 20s
test (macos-15, 3.12)	1m 45s
test (macos-15, 3.13)	2m 8s
test (windows-2025, 3.14)	4m 38s
test (windows-2025, 3.13)	3m 55s
coverage	1m 50s
All checks passed	4s
	53m 46s

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