[matt-edmondson]

Fixes #169

What changed

ktsu.Semantics.Color 5.12.1 is still the newest version on NuGet. In that version NamedColors.Green is #00FF00, which CSS calls lime. Before #69, ColorTranslator gave green as #008000. So after #69, -c green painted (0, 255, 0) and exited 0, with no warning.

• ColorParser.TryParse now maps green (case-insensitive) to #008000 before it looks in NamedColors. A comment says to drop this special case once Semantics 6 is on NuGet, since NamedColors "green" is #00FF00 (CSS "lime"), while gray and purple use CSS values, so names resolve to a different green than CSS Semantics#449 fixes the table upstream.
• New test EachKnownNameKeepsTheColourItPaintedBeforeTheNamedColorsSwitch pins each of the 12 opaque names to its old ColorTranslator value. If the upstream table changes again, a colour can't shift without a test failing.
• New test ParsesTransparentAsFullyTransparent checks transparent.
• CLAUDE.md records the special case and when to remove it.

I didn't move the Semantics packages to 6.x, because 6.x isn't on NuGet yet. This uses the fallback the issue allows. lime is not added, because 5.12.1 doesn't define it.

Verification

• Before the fix, only the green row of the new test failed: expected (0,128,0,255), got (0,255,0,255). It passes after the fix.
• dotnet test on IconHelper.Test: 101/101 pass, including the gold masters after git lfs pull.

Note, unrelated to this PR: restore on main now fails with NU1903 because of a new high-severity advisory for SixLabors.ImageSharp 3.1.12 (GHSA-v76p-62qx-wwq2). I ran the tests locally with -p:NuGetAudit=false. CI on this PR will probably go red at restore for the same reason until #145 (ImageSharp 3.2.0) or an equivalent bump lands.

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[matt-edmondson]

The first CI run failed at restore on every OS. This PR didn't cause it:

NU1903: Warning As Error: Package 'SixLabors.ImageSharp' 3.1.12 has a known high severity vulnerability (GHSA-v76p-62qx-wwq2)

main fails restore the same way, because the advisory affects the ImageSharp version pinned there. Dependabot's #145 already moves it to 3.2.0, so I've brought that same one-line bump into this PR (db7d18b) so it can go green. With 3.2.0, restore passes with the audit on, and IconHelper.Test passes locally, 101/101 including the gold masters. If #145 merges first, this commit becomes a no-op.

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[matt-edmondson]

Update on CI: I've reverted the ImageSharp 3.2.0 bump in 0fc5c20. On CI, 3.2.0's build targets fail with No Six Labors license found. Set $(SixLaborsLicenseKey)…, so the bump just swaps the NU1903 restore error for a build error. That is probably also why Dependabot's #145 is red. Locally it passed only because the license check doesn't run outside CI.

So this PR now contains only the green fix, and it stays red on the NU1903 error that main has too. There are two ways to clear it, and either is a maintainer decision rather than something to slip into this PR:

1. Suppress this one advisory with <NuGetAuditSuppress Include="https://github.com/advisories/GHSA-v76p-62qx-wwq2" /> in Directory.Packages.props, as PkmnDB#45 does, until ImageSharp is upgraded.
2. Add a Six Labors license key to CI (SixLaborsLicenseKey) and take 3.2.0 / 4.x.

Once main is fixed, merging it in here should turn this PR green, because the code change itself passes 101/101 locally.

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