Order doctor's diagnostic references deterministically

[lewisjared]

Follow-up to #865.

ref doctor produced a different report on each run. Several diagnostics share a name (the four ozone ones are all "Ozone Diagnostics"), and DiagnosticReference.sort_key was provider plus name only, so the tie broke on set iteration order. Two identical runs gave different missing-reference-data details, which makes a pasted report hard to diff.

• Adds the slug as the tiebreak, so the order is total.
• Drops a docstring reference to a --only flag that does not exist.

Found by running the checks against a real deployment and diffing --format json across three runs. Same three runs are now byte-identical.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0fb7b1d and 12986f1.

📒 Files selected for processing (4)

• changelog/870.fix.md
• packages/climate-ref-core/src/climate_ref_core/summary.py
• packages/climate-ref-core/tests/unit/test_summary.py
• packages/climate-ref/src/climate_ref/doctor/registry.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
core	93.73% <100.00%> (ø)
providers	87.70% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...s/climate-ref-core/src/climate_ref_core/summary.py	98.80% <100.00%> (ø)
...ges/climate-ref/src/climate_ref/doctor/registry.py	100.00% <ø> (ø)

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