fix(config): name the problem in the remaining untagged config errors

[wan9chi]

Motivation

#815 made task definitions and the task cache setting report the real parse error instead of data did not match any variant of untagged enum .... The other config values that accept more than one form were still #[serde(untagged)], so any mistake in them still got the generic error, which names an internal Rust type and not the problem:

Config	Before	After
command: 123	... untagged enum Command	invalid type: integer `123`, expected a command string or an array of command strings
dependsOn: [{ task: "build", form: "dependencies" }]	... untagged enum UserDependsOnEntry	unknown field `form`, expected `task` or `from`
dependsOn: [{ task: "build", from: "devDeps" }]	... untagged enum UserDependsOnEntry	unknown variant `devDeps`, expected one of `dependencies`, `devDependencies`, `peerDependencies`
cache: { input: [{ pattern: "src/**", bas: "workspace" }] }	... untagged enum UserInputEntry	unknown field `bas`, expected one of `pattern`, `base`, `auto`
cache: { input: [{ pattern: "src/**" }] }	... untagged enum UserInputEntry	missing field `base`
cache: { output: [{ auto: true, pattern: "src/**" }] }	... untagged enum UserOutputEntry	`auto` can't be combined with `pattern` or `base`
root cache: { script: true }	... untagged enum UserGlobalCacheConfig	unknown field `script`, expected one of `scripts`, `tasks`, `remote`

Command, UserDependsOnEntry, UserDependsOnFrom, and UserGlobalCacheConfig pick the variant from the value's type with UntaggedEnumVisitor, like #815. UserInputEntry and UserOutputEntry have two object forms, { pattern, base } and { auto }, so both forms are parsed as one struct and then checked. That way a mistyped key is listed with every accepted key. Valid configs parse as before, and run-config.ts is unchanged.

🤖 Generated with Claude Code

[github-actions]

fspy benchmark

linux

dynamic/launch             change  +0.38%  [ -2.73% ..  +3.43%]  overhead   +49.89%
dynamic/access             change  +0.00%  [ -1.95% ..  +1.08%]  overhead   +10.35%
dynamic/access-relative    change  -0.21%  [ -2.30% ..  +1.16%]  overhead   +60.95%
dynamic/access-contended   change  -0.39%  [ -2.60% ..  +1.46%]  overhead   +12.73%
static/launch              change  +0.62%  [ -2.07% ..  +4.39%]  overhead  +181.17%
static/access              change  +0.72%  [ -8.63% .. +13.02%]  overhead  +834.73%
static/access-relative     change  +0.22%  [ -1.41% ..  +2.19%]  overhead +1350.44%
static/access-contended    change  +0.20%  [ -0.69% ..  +2.04%]  overhead +3206.11%

macos

dynamic/launch             change  +0.03%  [ -3.21% ..  +2.83%]  overhead  +214.16%
dynamic/access             change  +0.00%  [ -3.13% ..  +2.00%]  overhead    +3.38%
dynamic/access-relative    change  +0.12%  [ -2.72% ..  +2.00%]  overhead  +242.12%
dynamic/access-contended   change  +0.10%  [ -4.06% ..  +5.45%]  overhead    +4.29%

windows

dynamic/launch             change  -0.48%  [ -2.41% ..  +1.24%]  overhead   +25.55%
dynamic/access             change  -0.20%  [ -0.96% ..  +0.58%]  overhead    +0.78%
dynamic/access-relative    change  +0.19%  [ -0.76% ..  +0.77%]  overhead    +1.17%
dynamic/access-contended   change  +0.00%  [ -0.91% ..  +0.93%]  overhead    +1.30%