test(scoring): cover pure upstream-constant parsers in scoring/model.ts

[JSONbored]

src/scoring/model.ts has no dedicated test file; its pure parser/detector functions are only incidentally exercised. Add a focused unit test that drives every branch of the pure exports so they reach 100% branch-counted patch coverage independent of the fetch paths.

Deliverables

• Create test/unit/scoring-model.test.ts
• parsePythonNumberConstants: underscore separators in integer AND fractional parts (1_000_000, 0.000_001, 3.14_15), exponents (1e-9, 5.8e1), knownOnly:true filtering vs knownOnly:false, and non-matching lines (skip via continue)
• findUnmodeledConstantKeys / findUnmodeledUpstreamConstants: assert known + NON_SCORING_UPSTREAM_CONSTANT_NAMES (e.g. EMISSION_SHARE_TOLERANCE, DEFAULT_PROGRAMMING_LANGUAGE_WEIGHT) are excluded and result is sorted
• detectActiveModel: pending_saturation_model, current_density_model, and unknown branches (both hasSaturationConstants and hasDensityConstants sides)
• scoringSnapshotStalenessWarning: exactly-at-window boundary (null) vs past-window (warning string), with explicit now arg
• isTimeDecayEnabled: each truthy token (1/true/yes/on, case-insensitive) and the falsey/undefined arm
• Do NOT test fetchText/fetchJson/getOrCreateScoringModelSnapshot network paths — scope to the pure exports

References

• src/scoring/model.ts:208
• src/scoring/model.ts:220
• src/scoring/model.ts:270
• src/scoring/model.ts:285
• src/scoring/model.ts:289

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size: S · gittensor:bug

[linear-code]

JSO-2208