chore: declare inceptionYear 2019 and normalise copyright headers

[OliverWolffGIP]

Why

<inceptionYear> is an inherited POM element, and the mycila license-maven-plugin binds the copyright ${year} to project.inceptionYear — not to the current year:

ldc           "year"
getfield      project
invokevirtual MavenProject.getInceptionYear()

cui-parent-pom held the only declaration in the hierarchy (2022), so this project reported 2022 and every -Ppre-commit run restamped every source header. Declaring the real year stops that.

The year

2019 — from this repository's own first commit, not the parent and not GitHub's created_at.

What is in this PR

Two things, and it is worth being precise about the second:

1. pom.xml gains <inceptionYear>2019</inceptionYear>, and the license plugin rewrites every source header to © 2019-present. This is the change being made.
2. Pre-existing gate drift, ~24 non-header lines. -Ppre-commit also runs OpenRewrite, which reorders imports, reformats, and adds build-plugin blocks. Confirmed pre-existing: running the gate on unmodified main, with no inceptionYear at all, produces the same kind of changes.

It cannot be split out. The gate re-applies it on the next run, so a header-only tree would not be gate-stable — and gate-stability is precisely the property this PR exists to restore.

Verification

The gate was run twice. The second run rewrote nothing and left a tree identical to the first. That idempotence is what was broken, so it is the thing checked — not merely that the build passes.

Confirmed afterwards that every .java header in the tree reads © 2019-present, with no stragglers on other years.

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