[CaffeinatedCoder]

Closes #470 (against release/10.x this closes nothing; the carry of 10.3.0 to main closes it, as #413 did #365)

Problem

This is step 2 of #470. None of the five ## [10.3.0] headings has a date, and the tag goes on the commit that dates them.

Change

Sets ## [10.3.0] — 2026-10-25 in the root changelog and in the four package changelogs. Nothing else changes, because Version is already 10.3.0 (#426).

Tests

• Every sub-issue of Epic: 10.3.0 #408 is closed. The last fixes, A Compare over ranges in a query runs another method, or runs in SQL, when it isn't IComparer's own #464 (PR fix: run a Compare over ranges in a query as the method the code called (#464, 10.x) #468) and Booking sample answers 500 for a null or missing stay #465 (PR fix: answer 400 for a null or missing stay in the booking sample (#465, 10.x) #469), are merged into release/10.x at 7c01380.
• CodoMetis.ValueRanges.Conventions.Tests passes locally on this branch (420/420).
• dotnet pack -c Release builds all four packages at 10.3.0, and their release notes open with the 10.3.0 section.
• dotnet run tools/oracles.cs seeds on a tree identical to release/10.x at 7c01380: the result will be posted on Release 10.3.0: date the changelogs, tag v10.3.0, carry the sections to main #470.

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