fix(BOP-506): remove dead TransferredFromSeizable event from frozen IB20V1 ABI

[rayyan224]

Summary

• Audit finding I-02 (BlockSec, "Base B20 V2 / PolicyRegistry Precompiles"): the frozen IB20V1 ABI declared TransferredFromSeizable, which was never part of the v1.1.1 / base-std Beryl surface and has no emit site on the V1 path. Seize logging on V2 emits Seized instead.
• Removed the dead event from crates/common/precompiles/src/common/abi/v1.rs.
• Updated the pinned V1_ABI_FINGERPRINT in crates/common/precompiles/src/common/abi/v2.rs to match the corrected event set.

Confirmed via grep that TransferredFromSeizable had no emit site or decode-path reference anywhere in the crate before removal, so this does not change any historical returndata/log output.

Linear: https://linear.app/coinbase/issue/BOP-506

Test plan

• cargo test -p base-common-precompiles --lib — 648 passed
• cargo test -p base-common-precompiles --features test-utils --test b20_asset_v1_golden --test b20_stablecoin_v1_golden --test b20_asset_v2_golden --test b20_policy_v1_golden --test b20_factory_v1_golden — 369 passed
• cargo clippy -p base-common-precompiles --lib --features test-utils -- -D warnings — clean

[linear]

BOP-506

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[github-actions]

No issues found.

The change is clean and correct:

• TransferredFromSeizable had no emit site, decode path, or any other reference in the codebase — confirmed via grep. Removing it from the frozen V1 ABI is safe.
• The V1_ABI_FINGERPRINT in v2.rs is updated to match the corrected event set, and the fingerprint pinning test (v1_abi_fingerprint_is_pinned) will catch any future drift.
• The V2 ABI is unaffected (it uses Seized instead, which remains in place).

[github-actions]

Base Std historical fork tests

Fork	Result	Passed	Failed	Skipped	base/base	base-anvil	base-std
Beryl	pass	616	0	13	14cfa4e0	6d744e03	4658f1b7
Cobalt	pass	711	0	14	14cfa4e0	ae7557c4	5a5605a3

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