feat: --set KEY=VALUE detector-config overrides (0.9.0)

[copyleftdev]

What

scan / explain gain --set KEY=VALUE (repeatable) to override any DetectConfig field by name:

$ anomalyx scan --set point_threshold=4.0 --set dist_alpha=0.01 data.csv
$ anomalyx describe | jq .config     # the settable keys + their defaults

The settable keys are exactly what describe's config object reports. An unknown key, or a value that doesn't fit the field's type, is a hard error (exit 2).

Why / design

Five of the config knobs already had dedicated flags (--fdr, --cad-max-cv, --period, --cadence, --no-column-roles); the rest (point_threshold, dist_alpha, mv_alpha, struct_null_rate, the min_ns, …) were compile-time only. --set is the general escape hatch. Implemented as a JSON round-trip over the serialized DetectConfig, so every field is settable with zero per-field code, and value parsing follows each field's current JSON type.

Overrides flow into config_version (e.g. pt=3.5000 → pt=2.0000), so a tuned run is exactly as reproducible and self-describing as a default one — tuning is never silent. No envelope/PROTOCOL change.

Demo (127k-row parquet)

--set point_threshold= → point findings: 2.0 → 38,102 · 3.5 (default) → 32,893 · 10.0 → 18,432. Unknown key and point_min_n=4.5 both exit 2.

Gate

proptest + cargo-mutants 0 missed on main.rs (77 caught / 6 unviable) — including a test that exercises the string-field override branch (re-setting an already-set cadence_column). Goldens unaffected (they use defaults). CI green.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 3bcef1be-3c55-4b9e-af58-a3ed68c9c139

📥 Commits

Reviewing files that changed from the base of the PR and between 47e3cb3 and 76e3c93.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• CHANGELOG.md
• Cargo.toml
• crates/anomalyx/src/main.rs
• docs/src/modes.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/config-set

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