align tooling with ts-lib-starter

[mrhyde]

Brings tvt onto the same toolchain as the template so future node and dependency bumps stop requiring per-repo workflow edits.

What changed:

• npm to pnpm 11.17.0, package-lock.json replaced with pnpm-lock.yaml. pnpm-workspace.yaml allows the koffi and @swc/core build scripts.
• node >=24 to >=26, volta pinned to 26.5.0.
• eslint and biome replaced with oxlint and oxfmt (@2bad/axiom 2.1.0). oxfmt reformatted nothing, so the source diff is limited to the enum change below.
• @2bad/tsconfig 3.0.2 to 4.0.0 and typescript 5.9.3 to 7.0.2.
• Workflows moved to blacksmith runners and read node from package.json. Check names are now version-free: build, test on blacksmith-4vcpu-ubuntu-2404, test on blacksmith-4vcpu-windows-2025. Branch protection on master has already been switched to these three contexts, so the old build on node@22 style checks are no longer required.
• publish.yml now installs and publishes with pnpm.

tsconfig 4.0.0 turns on erasableSyntaxOnly, which rejects the two enums in lib/types.ts. Both are now const objects. NET_SDK_ERROR loses its numeric reverse mapping, so the two call sites that turned an error code back into a name use a NET_SDK_ERROR_NAME map instead. rootDir is set in tsconfig.build.json because TS7 no longer infers it for the declaration build.

The build still uses swc rather than tsdown. tsdown emits stage-3 decorator syntax verbatim (oxc only transforms legacy decorators), which makes build/device.js unparseable, so device.ts's @auth and @measure usages block that swap. Tracked in #20.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.81%. Comparing base (0642eab) to head (37da735).

Files with missing lines	Patch %	Lines
source/lib/types.ts	0.00%	4 Missing ⚠️
source/device.ts	0.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #19      +/-   ##
=========================================
+ Coverage    2.60%   3.81%   +1.20%     
=========================================
  Files          11      11              
  Lines         345     236     -109     
  Branches       35      35              
=========================================
  Hits            9       9              
+ Misses        307     198     -109     
  Partials       29      29              

Flag	Coverage Δ
unit	3.81% <0.00%> (+1.20%)	⬆️

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