Record small key, declaration, and bundle baselines

Parent

Maintainers can repeat focused measurements and detect meaningful public-contract or bundle regressions.

Measure representative key/options construction stages and larger inputs using current tools and fixed fixtures.
Record advisory contract-only and scaled RPC/HTTP compiler diagnostics with the repository compiler and supported TypeScript 5.9 against workspace dependencies, using counts and measured cold/incremental context rather than universal timing thresholds.
Measure retained adapter code and distinguish its size from dependency-inclusive application bundles using existing build tools.
Preserve eager frozen trees, key immutability, validation, and request isolation.
Introduce a small optimization only for a measured relevant workload; defer broad JIT/AOT, memoization, compiler rewrites, editor-latency research, and new tooling.