chore: upgrade aztec to 4.2.0-nightly.20260408-1

[xorsal]

Summary

• Upgrade @aztec/* packages to 4.2.0-nightly.20260408-1
• Update all Nargo.toml tags to v4.2.0-nightly.20260408-1
• Update @defi-wonderland/aztec-benchmark to prerelease tarball
• Fix should_fail_with assertion in transfer_private_to_commitment_wrong_completer (error message changed upstream)

Test plan

• aztec test --package token_contract — 65/65 passed
• aztec test --package nft_contract — 61/61 passed
• aztec test --package vault_contract — 182/182 passed
• JS integration tests (token, nft, vault, escrow) — passed against local network
• CI passes

[cubic-dev-ai]

No issues found across 10 files

[github-actions]

Benchmark Comparison

CPU	Cores	RAM	Arch
AMD EPYC 7763 64-Core Processor	16	63 GiB	x64

Contract: escrow

🚦	Function	Gates			DA Gas			L2 Gas			Proving Time (ms)
		Base	PR	Diff	Base	PR	Diff	Base	PR	Diff	Base	PR	Diff
⚪	(partial) withdraw	579,408	579,408		1,312	1,312		495,400	495,400		7,169	7,316	+147 (+2.1%)
⚪	withdraw	579,408	579,408		736	736		483,700	483,700		7,140	7,288	+148 (+2.1%)
⚪	withdraw_nft	536,373	536,373		736	736		483,700	483,700		6,933	7,195	+262 (+3.8%)

Contract: logic

🚦	Function	Gates			DA Gas			L2 Gas			Proving Time (ms)
		Base	PR	Diff	Base	PR	Diff	Base	PR	Diff	Base	PR	Diff
⚪	get_escrow	520,851	520,851		128	128		456,000	456,000		6,854	6,962	+108 (+1.6%)
⚪	secret_key_to_public_keys	515,935	515,935		128	128		456,000	456,000		6,819	6,911	+92 (+1.3%)
⚪	share_escrow	420,067	420,067		704	704		474,500	474,500		6,006	6,101	+95 (+1.6%)

Contract: nft

🚦	Function	Gates			DA Gas			L2 Gas			Proving Time (ms)
		Base	PR	Diff	Base	PR	Diff	Base	PR	Diff	Base	PR	Diff
⚪	burn_private	455,161	455,161		416	416		671,675	671,675		6,360	6,397	+37 (+0.6%)
⚪	burn_public	340,915	340,915		448	448		691,760	691,760		5,360	5,453	+93 (+1.7%)
⚪	mint_to_private	472,217	472,217		960	960		662,581	662,581		6,428	6,459	+31 (+0.5%)
⚪	mint_to_public	340,915	340,915		448	448		694,916	694,916		5,368	5,403	+35 (+0.7%)
⚪	transfer_private_to_private	427,956	427,956		736	736		483,700	483,700		6,112	6,125	+13 (+0.2%)
⚪	transfer_private_to_public	455,237	455,237		416	416		666,473	666,473		6,323	6,318	-5 (-0.1%)
⚪	transfer_public_to_private	468,858	468,858		960	960		662,665	662,665		6,381	6,456	+75 (+1.2%)
⚪	transfer_public_to_public	340,915	340,915		384	384		648,357	648,357		5,379	5,396	+17 (+0.3%)

Contract: token

🚦	Function	Gates			DA Gas			L2 Gas			Proving Time (ms)
		Base	PR	Diff	Base	PR	Diff	Base	PR	Diff	Base	PR	Diff
⚪	burn_private	486,861	486,861		992	992		687,411	687,411		6,489	6,638	+149 (+2.3%)
⚪	burn_public	340,915	340,915		448	448		681,599	681,599		5,340	5,360	+20 (+0.4%)
⚪	initialize_transfer_commitment	403,443	403,443		704	704		474,500	474,500		5,898	5,955	+57 (+1.0%)
⚪	mint_to_private	473,137	473,137		960	960		656,449	656,449		6,466	6,466
⚪	mint_to_public	340,915	340,915		448	448		690,521	690,521		5,364	5,425	+61 (+1.1%)
⚪	transfer_private_to_commitment	453,824	450,450	-3,374 (-0.7%)	896	896		495,400	495,400		6,229	6,193	-36 (-0.6%)
⚪	transfer_private_to_private	470,985	470,985		1,312	1,312		495,400	495,400		6,274	6,340	+66 (+1.1%)
⚪	transfer_private_to_public	486,937	486,937		992	992		690,330	690,330		6,532	6,576	+44 (+0.7%)
⚪	transfer_private_to_public_with_commitment	497,197	497,197		1,568	1,568		723,630	723,630		6,568	6,571	+3 (+0.0%)
⚪	transfer_public_to_commitment	340,915	340,915		576	576		683,157	683,157		5,399	5,457	+58 (+1.1%)
⚪	transfer_public_to_private	469,793	469,793		960	960		659,611	659,611		6,394	6,460	+66 (+1.0%)
⚪	transfer_public_to_public	340,915	340,915		448	448		684,065	684,065		5,340	5,421	+81 (+1.5%)

Contract: vault

🚦	Function	Gates			DA Gas			L2 Gas			Proving Time (ms)
		Base	PR	Diff	Base	PR	Diff	Base	PR	Diff	Base	PR	Diff
⚪	deposit_private_to_private	904,856	904,856		1,280	1,280		894,014	894,014		10,084	10,063	-21 (-0.2%)
⚪	deposit_private_to_private_exact	1,017,026	1,017,026		1,856	1,856		936,548	936,548		10,943	11,075	+132 (+1.2%)
⚪	deposit_private_to_public	718,982	718,982		768	768		928,555	928,555		8,480	8,474	-6 (-0.1%)
⚪	deposit_public_to_private	589,551	589,551		1,344	1,344		959,628	959,628		7,365	7,413	+48 (+0.7%)
⚪	deposit_public_to_private_exact	748,093	748,093		1,920	1,920		1,002,324	1,002,324		8,742	8,787	+45 (+0.5%)
⚪	deposit_public_to_public	340,915	340,915		832	832		1,000,133	1,000,133		5,346	5,402	+56 (+1.0%)
⚪	issue_private_to_private_exact	1,017,026	1,017,026		1,856	1,856		936,824	936,824		10,911	11,064	+153 (+1.4%)
⚪	issue_private_to_public_exact	831,162	831,162		1,344	1,344		971,590	971,590		9,391	9,605	+214 (+2.3%)
⚪	issue_public_to_private	639,893	639,893		1,344	1,344		968,462	968,462		7,859	7,893	+34 (+0.4%)
⚪	issue_public_to_public	340,915	340,915		832	832		1,000,436	1,000,436		5,348	5,478	+130 (+2.4%)
⚪	redeem_private_to_private_exact	1,013,679	1,013,679		1,856	1,856		937,055	937,055		10,890	10,973	+83 (+0.8%)
⚪	redeem_private_to_public	718,905	718,905		768	768		919,369	919,369		8,410	8,471	+61 (+0.7%)
⚪	redeem_public_to_private_exact	698,526	698,526		1,920	1,920		999,453	999,453		8,292	8,394	+102 (+1.2%)
⚪	redeem_public_to_public	340,915	340,915		832	832		987,833	987,833		5,346	5,423	+77 (+1.4%)
⚪	withdraw_private_to_private	901,509	901,509		1,280	1,280		893,840	893,840		9,985	10,058	+73 (+0.7%)
⚪	withdraw_private_to_private_exact	1,013,679	1,013,679		1,856	1,856		936,617	936,617		10,897	11,064	+167 (+1.5%)
⚪	withdraw_private_to_public_exact	831,084	831,084		1,344	1,344		962,194	962,194		9,369	9,470	+101 (+1.1%)
⚪	withdraw_public_to_private	586,272	586,272		1,344	1,344		955,866	955,866		7,338	7,424	+86 (+1.2%)
⚪	withdraw_public_to_public	340,915	340,915		832	832		987,752	987,752		5,362	5,416	+54 (+1.0%)