* refactor: replace @containerbase/eslint-plugin and eslint-plugin-import-x with local rules and biome
The two containerbase ESLint rules (test-root-describe, no-tools-import) are now
implemented locally in tools/lint/rules.js, removing the external dependency.
All eslint-plugin-import-x rules are dropped: default, named, namespace, and
no-cycle are already covered by oxlint; no-unresolved is covered by TypeScript;
no-extraneous-dependencies is replaced by biome's noUndeclaredDependencies.
* fix: exclude eslint.config.mjs from type-checking
eslint-plugin-promise has no type declarations. Previously this was
masked by @types/eslint pulled in transitively via eslint-plugin-import-x.
The config file is not application code and gains nothing from type-checking.
* refactor: drop eslint-plugin-promise, move covered rules to oxlint
The promise rules target .then()/.catch() patterns which are rare in an
async/await codebase. The 4 rules oxlint supports (catch-or-return,
no-callback-in-promise, no-new-statics, valid-params) are moved there.
* fix: prettier formatting after removing eslint-disable comment
renovate[bot]