Replace all in-scope axios callsites with a new helpers/http.js wrapper over native fetch, including JSON/text GET, JSON POST, HEAD checks, and transient 5xx retry behavior; update all browser, build, script, and proxy API clients to use it; add focused unit tests; and remove axios from package dependencies.
Constraint: Preserve API/build and deployment behavior while lowering transport surface area.
Rejected: inline fetch replacements at each callsite | rejected to avoid inconsistent error/retry semantics.
Confidence: high
Scope-risk: moderate
Directive: Keep helper in place as the transport boundary and update tests when changing request semantics.
Tested: pnpm run -s typecheck, pnpm -s run test-prebuild, pnpm -s run test, pnpm -s run test:browser, pnpm -s run netlify-build, smoke GETs on /apple-silicon-app-test and /apple-silicon-app-test/?version=2
Not-tested: branch/netlify deployment health in CI pipeline after merge
