SWI-11363 chore: replace "adapter" with "translator" throughout

[kshahbw]

BLUF

Finishes the Migration Toolkit rebrand (#21), which renamed the product in prose but left 229 references to "adapter" in env vars, code identifiers, filenames, and runtime strings. Zero remain. No backward-compatible aliases — existing deployments must update their environment.

Three referents, three words

The word "adapter" was doing three different jobs, so a blanket find-and-replace would have made things worse:

Referent	Now called	Why
The running proxy	translator	Matches the product name the rebrand already established ("Real-Time Translator")
The src/server types	server	TranslatorConfig would collide with the much narrower src/translator module — it's the server's config, not the translation engine's
The whole three-step product	toolkit	AGENTS.md's paired model, CONTRIBUTING, and the issue templates cover all three tools

⚠️ Breaking change

Old	New
ADAPTER_ACCOUNT_SID	TRANSLATOR_ACCOUNT_SID
ADAPTER_AUTH_TOKEN	TRANSLATOR_AUTH_TOKEN
ADAPTER_CAPTURE_DIR	TRANSLATOR_CAPTURE_DIR
ADAPTER_LOG	TRANSLATOR_LOG

What changed

Renamed identifiers — AdapterConfig/AdapterDeps/AdapterError/adapterErrors → ServerConfig/ServerDeps/ServerError/serverErrors.

User-visible strings — the 90002 body is now "Internal translator error"; the message played into the call on an unsupported verb; the translator listening on… startup log; 7 finding messages in translate.ts; 8 notes fields in twilio-voice.json (these surface in the playground and compat reports).

OpenAPI spec — retitled Real-Time Translator (Voice), adapterHost → translatorHost.

Files renamed — openapi/twilio-compat-adapter.yml → twilio-compat.yml ("compat" already carries it); scripts/bench-adapter-overhead.ts → bench-translator-overhead.ts. The bench:overhead npm script name is unchanged.

Docs — README, SECURITY, docs/demo.md, AGENTS.md, CONTRIBUTING, web/README.md, and both issue templates. Also fixed the stale bw-voice-adapter repo URL in the issue-template config (it was redirect-only).

Tests — ~30 inert fixture hostnames (adapter.test → translator.test) plus the assertions that move in lockstep with the message changes above.

Verification

• npm run typecheck — clean
• npm test — 303/303 passing across 43 files
• npm run playground:build — builds (506 KB)
• npm run compatibility-check -- examples/full-pv-app — smoke-tested, correct output

Reviewer notes

• The sed passes ran over the tracked web/fonts/*.woff2 binaries. I verified them byte-for-byte against HEAD — unchanged — and removed three zero-byte temp files macOS sed left behind. Worth a glance.
• Not fixed here (pre-existing): AGENTS.md still references a "checked-in .env" that isn't tracked in the repo. Happy to clean that up separately.
• Old adapter/* branch names are left alone — they're historical.

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