Added TickOracleLibrary.sol with the five requested helpers, ported from v3-periphery’s OracleLibrary. It exposes no liquidity value because the hook does not record one.

Added multi-block fixture tests for consult windows, ring wrap, quotes, block-start ticks, and timestamp wrap. I reviewed the port against the v3 source and hook interface; no outstanding issue found. The full suite passed 126 tests, with one RPC-dependent fork suite skipped. Formatting passed. Only the two allowed files were added.

The review is complete. Findings are written to .imd-findings.json in the repository root, and no source or test file was touched. The scratch copy I used for mutation runs lived under /tmp and has been deleted.

Verdict on the port. The library is a faithful line-by-line port of v3-periphery's OracleLibrary. Every item the assignment asked me to compare checks out:

• Rounding of negative means matches v3 in both consult and the weighted mean. The ring test hits 59 negative non-divisible windows out of 118, so that half is genuinely verified.
• int56/uint32 casts are the same as v3. The int24 narrowing cannot truncate because the cumulative cannot wrap within a uint32 time span.
• Uninitialized-slot fallback to slot 0 is present and exercised at four points before the ring wraps.
• getBlockStartingTick reverts on cardinality below 2, returns the recorded last tick when the newest observation is older than the block, and otherwise divides the cumulative delta. The "previous slot unwritten" revert is ported but unreachable through this hook.
• getQuoteAtTick cannot overflow at either tick limit. I recomputed all seven expected quotes and both uint128 boundary values with an independent Python port of v3's TickMath, and every constant in the test matches.
• The three timestamp-driven tests execute as written under via-IR. I checked this because the optimizer can fold repeated timestamp reads, and a scratch probe of mine did stall that way, but the committed tests warp correctly.

Findings, ranked.

1. Medium. The sign guard on rounding is never load-bearing. Both multi-block tests start with a zero-for-one swap, so the tick only takes the values -20 and 0 and every window mean is at or below zero. A port that decrements on any nonzero remainder passes all six tests but returns 4 instead of 5 for a window of tick 19 for one second then -1 for two seconds. The weighted-mean test has the same blind spot.
2. Low. getBlockStartingTick is never called in a block whose write landed on slot 0 after the ring wrapped. A port that computes the previous index without the modulo wrap passes all tests but panics with underflow for a two-slot buffer after two swaps in consecutive blocks.
3. Info. The "ONI" revert cannot fire through the hook and is untested. This is a faithful port of a defensive check, not a defect.

No defect was found in the library's arithmetic or in its agreement with v3. The two real findings are test-coverage gaps, each with a call sequence that distinguishes the correct port from a plausible wrong one.