* feat(sdk): add SDK foundation — type declarations, errors, and utilities
Adds standalone SDK building blocks with no SDK source dependencies:
- sdk.d.ts: ambient type declarations for SDK bundle
- coreSchemas.ts + coreTypes.generated.ts: Zod schemas and generated types
- errors.ts: SDK-specific error classes
- validation.ts: input validation utilities
- messageFilters.ts: extracted message filter logic
- handlePromptSubmit.ts: imports from messageFilters
- 16 generated-types tests
* fix(sdk): narrow assertFunction type from broad Function to callable signature
Code review finding: assertFunction used `asserts value is Function` which
accepts any function-like value without narrowing. Changed to
`(...args: any[]) => any` for better type safety.
* fix(sdk): update sdk.d.ts header — manually maintained, not generated
Reviewer noted the header said "Generated from index.ts" but no generator
produces this file. Updated to "Manually maintained — keep in sync with
index.ts". Drift detection added in validate-externals.ts (PR 3).
* fix(sdk): align sdk.d.ts types with canonical coreTypes.generated.ts
Tighten SDK public type contract to resolve reviewer blockers:
- PermissionResult: unknown[] → precise 6-shape discriminated union
(addRules/replaceRules/removeRules/setMode/addDirectories/removeDirectories)
- SDKSessionInfo: snake_case → camelCase (sessionId, lastModified, etc.)
- ForkSessionResult: session_id → sessionId
- SDKPermissionRequestMessage: uuid + session_id now required
- SDKPermissionTimeoutMessage: added uuid + session_id
- SessionMessage: parent_uuid → parentUuid
- SDKMessage/SDKUserMessage/SDKResultMessage: replaced loose inline
definitions with re-exports from coreTypes.generated.ts
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Co-authored-by: Ali Alakbarli <ali.alakbarli@users.noreply.github.com>
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