Migrate from ESLint to oxlint

[veksa]

This swaps ESLint out for oxlint. The main motivation is the upcoming move to TypeScript 7 (typescript-go): the @typescript-eslint toolchain is tied to the TypeScript compiler API and becomes a blocker there, whereas oxlint is a standalone Rust linter that doesn't depend on it. It's also dramatically faster and drops a large chunk of the dependency tree — installing this branch removes around 150 transitive packages.

What changed

The old .eslintrc and .eslintignore are gone, replaced by a single .oxlintrc.json. It turns on the correctness category as errors and keeps the two rules the project actually relied on: consistent-type-imports (with separate-type-imports, same as before) and the relaxations for test and example files. The lint script now runs oxlint src test, and all the @typescript-eslint / eslint / eslint-plugin-* dev dependencies are replaced by a single oxlint entry. The few inline eslint-disable comments were rewritten to the oxlint-disable equivalents.

Code fixes

oxlint's correctness category is stricter than eslint:recommended, so the migration surfaced 44 findings. I fixed all of them in place rather than silencing rules:

• In src: replaced the Object wrapper type with object in weakMapMemoize, dropped the redundant parameter-property assignments in proxy, and turned the x !== 0 && x-- short-circuits into plain if statements.
• In test: the Chai getter-style assertions (.that.is.not.empty, .to.be.true) were rewritten to their callable forms so they no longer look like unused expressions, without re-evaluating any selector (so recomputation counts stay intact). The bare property reads in the benchmarks now feed a sink variable, and a couple of dead expression statements were tidied up.

Follow-up: consistent-type-exports needs TypeScript 7

The old config also had @typescript-eslint/consistent-type-exports enabled. In oxlint that rule is only available through type-aware linting, which requires TypeScript 7 (typescript-go) and the oxlint-tsgolint package. I left it out for now because typescript-go rejects the current tsconfigs — moduleResolution: "Node" (node10) and baseUrl have been removed in TS7, and the paths entries need to be relative. There's a TODO(ts7) in .oxlintrc.json describing exactly what to add once the tsconfigs are migrated, so restoring the rule is a small follow-up on top of the TS7 work.

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