Add the EnergyPlus adoption caller, and the command that lists an adopted release

[samuelduchesne]

1. Purpose

This pull request adds the EnergyPlus adoption caller for this project, together with the command that the roster's release-rows step runs. It is part of spec 012 (specs/012-energyplus-release-adoption in idfkit-unification). The steps and the gate are declared for idfkit-developers in governance/energyplus.toml of idfkit-conformance at governance-2026.25.

2. Changes

1. .github/workflows/adopt-energyplus.yml: calls the reusable adopt-energyplus.yml of idfkit-conformance at governance-2026.25, and states the tag a second time as governance_level. It holds no logic. It grants contents: write and pull-requests: write only. It never merges, publishes or releases.

2. scripts/adopt_release.py: lists an adopted release in the two places that enumerate every release:

   • the table of releases in docs/reference/versions.md, where the release takes the first open pair of cells, or a new row when the table has none;
   • the printed list under "Available schema versions" in docs/getting-started/core-tutorial.ipynb, where the release's tuple is appended.

   The command refuses a release that the installed idfkit does not list, and a second run changes nothing. Exit codes: 0 when both places list the release, 1 when the release cannot be listed, 2 when the arguments are wrong.

3. tests/test_adopt_release.py: 6 tests against the committed pages, covering the open row, a full table, the appended tuple, idempotence, the refusal and a missing table.

3. Verification

1. make check passes, with pyright reporting 0 errors, and the 6 new tests pass.
2. The conformance caller check (caller_problems at governance-2026.25) reports no problem.
3. Against the pinned library: 26.1.0 exits 0 and reports that both places already list it. 26.2.0 exits 1, because the installed idfkit does not list it.
4. Not verified: a run of the workflow on GitHub. A caller can run only once it is on the default branch. In the roster, this project waits on a release of idfkit and of @idfkit/schemas that carries the release, so a dispatch before then reports waiting.

[github-actions]

Docs preview for this PR is available at:
https://developers.idfkit.com/pr-preview/pr-27/