Approved workflow

Release Streak (token symbol STREAK) on Sepolia as a univ4_hook launch. Token: Streak (STREAK), total supply 1,000,000,000 STREAK with 18 decimals, minted once to the deployer. Hook: BuyStreakHook, a Uniswap v4 hook on the token's native-ETH pool that rewards daily buyers with a lower fee. Days: day = block.timestamp / 86,400 (UTC). Streaks are per pool and per identity (rule below). A qualifying buy is zeroForOne with an ETH leg of at least 0.0005 ETH; on one, if lastDay == today nothing changes, if lastDay == today - 1 then streak += 1, otherwise streak = 1; then lastDay = today and StreakUpdated(poolId, user, day, streak) is emitted. Effective streak = streak when lastDay >= today - 1, else 0 (a missed day resets). Every swap in both directions pays max(100 - 10 x effective streak, 30) bps of its ETH leg, priced from the streak before this swap updates it (1% at 0, 0.9% at 1, down to 0.3% from day 7), charged with the ETH-leg mechanics below. Sells never extend a streak. Fees accrue as ETH claims whose only destination is permissionless burnFees(), which takes them all to 0x000000000000000000000000000000000000dEaD. Views: streakOf(poolId, user) returning streak, lastDay, effective streak and fee bps now; feeFor(poolId, user). ETH-leg fee mechanics (as live launch 170's MedallionHook): a buy is zeroForOne (ETH in), a sell oneForZero (ETH out), and the swapper's specified amount is always honoured exactly. With ETH specified (exact-in buys, exact-out sells) the fee is a positive specified BeforeSwapDelta in beforeSwap of floor(|amountSpecified| x bps / 10,000); with ETH unspecified (exact-out buys, exact-in sells) it is a positive unspecified delta in afterSwap of floor(ETH the pool moved x bps / 10,000). That fee base is the swap's ETH leg. A partial fill (price limit hit) reverts with PartialFill. The hook settles each fee by minting itself ERC-6909 ETH claims (poolManager.mint) inside the swap, never take() or an ETH transfer in a callback, so the first buy into the ETH-less pool works; every payout burns claims and takes ETH in the hook's own unlockCallback, balance zeroed first (CEI). A fee that rounds to 0 is 0, so dust never reverts. Invariant: the hook's ETH claims at the PoolManager equal everything it still owes. Identity: abi.decode(hookData, (address)) only when hookData is exactly 32 bytes, non-zero and equal to tx.origin, so nobody can borrow another address's standing to lower a fee; any other swap has no identity, pays the full 1% and updates no streak. tx.origin only confirms that claim for pricing and never authorises moving funds; the README says smart-contract wallets (signed by a bundler or relayer) never earn a discount. Deploy shape (as live Sepolia hook launches 170, 183 and 186, constructor per the context): every rate, window and threshold is a source constant; no admin, setter, pause, upgrade or sweep. Permissions are exactly beforeSwap, afterSwap, beforeSwapReturnDelta and afterSwapReturnDelta (address bits 0x00CC), all others false, checked by Hooks.validateHookPermissions in the constructor with a CREATE2 salt mined for those bits. The factory initializes the pool (currency0 native ETH, currency1 STREAK, fee 3000, tickSpacing 60) and seeds one-sided STREAK liquidity; the hook must revert neither, and the first buy lands in a pool with no ETH. State is keyed by PoolId; a pool whose currency0 is not native ETH gets zero deltas and no other effect. Every callback requires msg.sender == PoolManager. Tests (Foundry, a real v4-core PoolManager deployed in the test, hook at a mined address): a launch rehearsal that initializes at the manifest price, seeds one-sided liquidity like the factory and makes the first buy into the ETH-less pool; all four swap modes; dust; a non-ETH pool; non-PoolManager callers revert; fuzzed sizes; and the cases the write-foundry-tests step lists (UTC day boundary, two buys in a day, a missed day, the 0.3% floor, the 0.0005 ETH threshold, sells, burnFees, pool isolation, a mismatched hookData). The independent adversarial review (read-only) attacks the hookData == tx.origin check, day arithmetic, any way to extend or borrow a streak without a qualifying buy, fee sign and rounding on all four swap modes, and burnFees accounting; its step lists each target. Website: one static page (dist/index.html) reading the hook's views and events, with a buy/sell form that swaps through the Sepolia PoolSwapTest router named in the site step and puts the connected wallet in hookData; it shows the connected wallet's streak, a 30-day calendar built from StreakUpdated events, and the fee it would pay right now. Streak is a Sepolia test toy: its token and any pot have no value, and nothing here promises a return.

Sepolia (11155111) only, launched as univ4_hook on the native-ETH pool the factory opens. GitHub publication and IPFS hosting are approved. Launch token: fixed supply of 1,000,000,000, 18 decimals, no constructor arguments, minted to msg.sender, no mint or admin. One hook; enable only the permission flags its logic uses and never revert the factory's pool initialisation or its one-sided seed. Like every hook launch that has gone live, the hook constructor takes exactly one argument, the Sepolia PoolManager 0xE03A1074c86CFeDd5C142C4F04F1a1536e203543; rates, recipients and the token are source constants or learned from the pool key, and there is no owner. Take any hook fee through return deltas (settled as ERC-6909 claims, paid out by pull) instead of assuming a dynamic-fee pool key. Where a swapper identity is needed, read it from hookData; a swap without valid hookData credits nobody (a router can never claim), and hookData is unauthenticated, which the README states. No external oracles or VRF, no proxies, delegatecall or selfdestruct. foundry.toml sets bytecode_hash = "none". Any website is a static export with index.html in dist/. Site label lab-streak-hook.

Build STREAK and BuyStreakHook (permissions beforeSwap, afterSwap and both return deltas; PoolManager-only constructor) with a launch-rehearsal Foundry suite and an independent adversarial review, deploy them through the factory on Sepolia, then build the one-page site against the live pool.

Website: one static page (dist/index.html) that reads the hook's views and events and the pool price through Uniswap's Sepolia StateView 0xe1dd9c3fa50edb962e442f60dfbc432e24537e4c, with a buy/sell form that swaps through Uniswap's published Sepolia PoolSwapTest router 0x9b6b46e2c869aa39918db7f52f5557fe577b6eee (has code; manager() is the PoolManager above) and puts the connected wallet in hookData.

It shows the connected wallet's streak, a 30-day calendar built from StreakUpdated events, and the fee it would pay right now.