feat(ai): add AI stream types

[Reversean]

AiStreamPart carries an answer received by model and converted for further rendering.

Currently it unites following types: AiStreamTextDeltaPart (text increments) and AiStreamErrorPart (failure description).

AiStream carries part sequence asynchronously.

Tsconfig target moves from es6 to es2024 because AsyncIterable type is delivered only since es2018.

[Copilot]

🟢 Approval recommended

The PR is small and additive, with only minor consistency/alignment nits noted that do not affect correctness.

Pull request overview

Adds foundational AI streaming type definitions to @hawk.so/types so downstream code can model AI-generated responses as an async sequence of discriminated “parts”.

Changes:

• Introduces AiStreamTextDeltaPart, AiStreamErrorPart, AiStreamPart, and AiStream types under src/ai/stream.ts.
• Exports the new AI stream types from the root index.ts (and corresponding build outputs).
• Updates TypeScript compilation target to es2018 and bumps package version to 0.7.0.

File summaries

File	Description
tsconfig.json	Updates TS target to es2018 to support async-iterable typing during build.
src/ai/stream.ts	Adds the new AI stream part and stream type definitions.
index.ts	Re-exports AI stream types from the package entrypoint.
package.json	Bumps package version to 0.7.0.
build/src/ai/stream.js	Generated JS stub for the new module.
build/src/ai/stream.d.ts	Generated type declarations for AI stream types.
build/index.js	Re-exports the new build module at runtime entrypoint.
build/index.d.ts	Re-exports the new type module at types entrypoint.

Review details

Suppressed comments (1)

src/ai/stream.ts:19

• This object-shaped export is declared as a type alias, but the codebase overwhelmingly uses export interface for object types (e.g. src/auth/tokensPair.ts, src/dbScheme/promoCode.ts). Using an interface here improves consistency and makes future extension/augmentation easier.

export type AiStreamErrorPart = {

• Files reviewed: 5/8 changed files
• Comments generated: 1
• Review effort level: Lite

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[Reversean]

These stay type because they're members of a discriminated union that gets exhaustively matched on .type – an interface can be reopened and merged into by any importer, so a variant's shape would no longer be fixed by its declaration, while interface still fits standalone, extendable shapes elsewhere in the package.