fix: debug goblin reset logic

[iakovenkos]

• transcript_builder: gate hiding op handling on is_zk so index 0 goes through the normal main loop when is_zk=false (root bug: sentinel x-coordinate was written to ECCVM Px without infinity flag, causing ECCVM/Translator accumulated_result mismatch)
• ecc_op_queue: add get_is_zk() getter; remove (0,0) coordinate override in eq_and_reset that destroyed the infinity flag (the transcript builder already zeros coords for infinity points)
• eccvm_flavor: pass is_zk to compute_rows
• goblin.hpp: add set_op_queue_zk() setter
• mock_circuits: restructure for non-ZK — only last-prepended circuit gets 4 leading no-ops (translator padding), every circuit gets eq_and_reset, end random ops gated on is_zk
• goblin_verifier.test: set op_queue_zk(false), add BB_DISABLE_ASSERTS
• goblin.cpp: remove debug trace checker

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