Serialize a category as its CLI slug, not a second spelling

[UnbreakableMJ]

A category went out under two different names:

{ "category": "package-gc",          // the group, from Category::slug
  "candidates": [
    { "category": "package-manager-gc" }   // the candidate, from a serde derive
  ] }

The group used Category::slug; each candidate used #[serde(rename_all = "kebab-case")] over the variant name. A consumer that read a candidate's category could not feed it back to --category, which only accepts the slug.

Only PackageManagerGc was affected — the one variant whose name doesn't kebab-case to its slug. That is precisely what made it easy to miss: four of five categories agreed, so the two spellings looked interchangeable.

Fix

Serialize is now hand-written and delegates to slug(), making the slug the single source of truth across the command line, candidate records, group headings, and the introspection schema. A derive cannot express that — it necessarily restates the mapping, so any variant renamed without a matching slug change reintroduces the divergence silently.

Tests

Three, and the first two are the ones that matter long-term:

• every variant in Category::ALL serializes to its slug — a new category whose name doesn't kebab-case to its slug fails here, not in someone's pipeline
• every serialized form parses back through from_slug
• a candidate and its group report the same string (pins this specific regression)

Verified

group     -> package-gc
candidate -> package-gc
"package-gc" fed back to --category: accepted

Compatibility

This changes JSON output for anything matching the literal package-manager-gc. Nothing in the tree did (checked). At 0.1.0 the alternative is carrying two spellings of one identifier indefinitely, so it is better done now than after adoption.

🤖 Generated with Claude Code

https://claude.ai/code/session_01FCJbPm4FWS99y9utbUe13z

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