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:boom: Modernize the toolchain and ship dual ESM + CJS (#13)

pnpm · tsdown (dual ESM + CJS) · Vitest · Biome · TypeScript 7 · shared CI from
`tselect-npm/.github@v1`. Third repo through the modernization runbook, after `url`
(the pilot) and `thrown`.

The branch's gitmoji series, which the squash would otherwise discard:

    :bug:                 Stop shipping test, coverage and config cruft in the published package
    :wrench:              Migrate to pnpm
    :sparkles:            Add dual ESM + CJS build via tsdown, on TypeScript 7
    :white_check_mark:    Migrate test suite to Vitest
    :heavy_minus_sign:    Drop lodash, vendoring its one use
    :bug:                 Add the missing put member to THTTPMethod
    :rotating_light:      Replace TSLint with Biome
    :memo:                Add LICENSE, keywords and a full README API section
    :construction_worker: Run CI from the org-wide reusable workflow
    :construction_worker: Add the release caller workflow

BREAKING CHANGE: three independent breaks.

* `engines.node` is now `">=22"`, the bottom of the CI matrix, so the floor is tested
  by construction.
* `THTTPMethod` gains `'put' | 'PUT'`. This widens the return type of `toLowerCase`
  and `toConstantCase`, so exhaustive switches over their result stop compiling. The
  union had always omitted `put` while `HTTPMethod.PUT` existed, so passing the
  package's own enum to its own function did not compile. Runtime was always correct.
* The `exports` map closes deep imports. No consumers of
  `@tselect/http-method/dist` were found.

Headline fix: `toPascalCase` threw under ESM. lodash assigns its exports dynamically,
so `cjs-module-lexer` cannot detect them for CJS→ESM interop, and
`import * as Lodash from 'lodash'` produced a namespace with no `capitalize`. Nothing
was broken in the field, since 1.0.0 is CommonJS-only, but shipping dual-format
without the fix would have broken every ESM consumer. Vendoring the one helper drops
lodash and ta... (continued)

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