[CaffeinatedCoder]

Closes #180

Problem

The workflow comments still described the branch plan that #36 and #38 replaced: release/10.x from a v10.0.0 tag as the LTS line, net11 shipping the .NET 11 previews, release/5.x "once it is cut", and 10.x tags in the Latest-release logic. dotnet.yml and pr-hygiene.yml also still triggered on net11, which #38 dropped and CONTRIBUTING.md no longer lists. No consumer sees any of this; it misleads whoever reads the workflows next.

Change

• dotnet.yml: the header names release/5.x (cut from v5.5.0) and main (SchemaKit, previews tagged on main); the gate comment says main and release/5.x; net11 is gone from the triggers.
• pr-hygiene.yml: net11 gone from the trigger.
• nightly.yml: main moves to .NET 11 with SchemaKit 11.0.0-preview.1: the first slice of the new API, on EF Core 11 / Npgsql 11 under the new ids #38, not at the cut; a new line is covered the night after it is cut.
• release.yml: the Latest comment says 5.x tags, not 10.x.
• CLAUDE.md: the CI section's trigger list matches.

The net11 branch itself is left alone; deleting it is a separate call.

Tests

Comments and trigger lists only. WorkflowGateConventionTests, CiInputConventionTests, ReleaseWiringConventionTests, ClaudeMdConsistencyTests and DocumentationLinkTests pass locally (27 tests). The same change follows on release/5.x as a cherry-pick once this merges.

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