chore(bindings): TypeScript 7, nodenext resolution, and the Biome canon

[andrescera]

Affected repo & language: srtla — TypeScript (bindings/typescript only)

What

Brings the TS bindings package onto TypeScript 7.0.2 with nodenext module resolution,
and adopts the shared Biome canon (@ceralive/biome-config@2026.8.0, Biome 2.5.8) —
which this package had no lint coverage from at all until now.

Adopting Biome meant renaming a script that already existed under a misleading name:
lint used to be tsc --noEmit. It is now biome check ., and the typecheck moved to
its own typecheck script. bindings.yml was updated so the type gate is not silently
dropped: the old single "Type-check" step is now two steps, Lint and Type-check.

The C/C++ receiver and everything outside bindings/typescript are untouched.

Why

@ceralive/biome-config@2026.8.0 is published and is the workspace-wide lint/format
canon. This package and the cerastream bindings were the last two TypeScript packages in
the workspace with zero Biome coverage — a lint break could land here and nothing
would say so.

TypeScript 7 is the workspace direction for packages that can take it (the compiler is
verified per package with tsc --version rather than assumed from the manifest), and
this package can: it has no Svelte, no compiler-API consumer, and no svelte-check.

How to verify

cd bindings/typescript
bun install --frozen-lockfile
bun run lint        # biome check .   — 25 files, clean
bun run typecheck   # tsc --noEmit
bun x tsc --version # 7.0.2
bun run test        # 136 tests
bun run build
git status --porcelain   # must be empty: the committed dist matches a fresh build

The published API is unchanged. To confirm rather than take my word for it, build dist/
from main in a worktree and compare the exported names:

git worktree add /tmp/srtla-main origin/main
# build in both, then compare sorted Object.keys(await import(...)) for
# index / sender / receiver / telemetry, and the `declare ...` lines in dist/*.d.ts

All four entrypoints (index 26 / sender 8 / receiver 9 / telemetry 7 exports) come back
identical.

Risks

The interesting one, and the reason this PR is worth reading rather than skimming:
Biome's organizeImports assist re-sorts re-exports but leaves JSDoc comments where
they were. In src/sender/index.ts (a barrel of three export * from) the first
--write pass orphaned a /** @deprecated */ block and stripped the doc off
export * from './types.js'. Lint was perfectly green; the repo's own ADR-003
deprecation-coverage.test.ts went red. That is fixed here, and it is the reason the
verification steps above run the test suite and not just lint.

Second: dist/ is tracked in this package, so adopting the canon formatter produces a
real dist diff (tsc re-prints from the reformatted AST). It was reviewed and classified
— line re-wrapping at the 100-col canon, import/export member ordering, and two
tsconfig-driven syntax differences (numeric separators preserved under target: es2023;
.d.ts object-key ordering from the TS7 declaration emitter). Zero value, identifier,
control-flow or export-name changes.

Biome's unsafe autofix for noNonNullAssertion (x! → x?.) was not taken — it
changes runtime semantics. All five hits were redundant assertions
(noUncheckedIndexedAccess is off, so lines[i] is already string), so the ! was
simply deleted, which is semantics-preserving and keeps the typecheck green.

Upgrade ledger

Package	From	To	Note
typescript	^5.9.3	^7.0.2	two majors; moduleResolution moved node → nodenext
@biomejs/biome	—	^2.5.8	new dependency; package had no linter before
@ceralive/biome-config	—	^2026.8.0	new dependency (published canon)
@types/bun	^1.3.14	^1.3.14	already current
zod	^4.4.3	^4.4.3	already current

Held back / not taken: nothing. bun outdated returns empty after the bumps.
TypeScript 7.1.0-dev.* prereleases remain forbidden.

New biome-ignore comments: none. The 37 first-run diagnostics were all formatting
and import ordering, fixed by a single biome check --write . with no rule disabled and
no override added.

Config note: biome.json excludes dist and test-results from files.includes —
dist is tsc-formatted output, not Biome-formatted, and including it produces hundreds
of bogus format diagnostics.