Feature/ak 001 core domain types

[y-aithnini]

Summary

• What does this PR change?

Why

• Why is this change needed?

Checklist

• Added/updated tests (if behavior changed)
• npm run lint passes
• npm run typecheck passes
• npm test passes
• npm run build passes
• Added a changeset (npx changeset) if this affects consumers

Notes

• Anything reviewers should pay attention to?

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Introduces a first pass of “core domain” building blocks for AuditKit (framework-free types, ports, DTO schemas, and domain errors) and exposes them via src/core/index.ts to form a public core API.

Changes:

• Added core domain model types (audit log, actors/resources, filters/pagination) plus runtime type guards.
• Added hexagonal “ports” interfaces (repository, change detector, ID generator, timestamp provider) and barrel exports.
• Added Zod-based DTO schemas for create/query/response payloads and added domain-specific error classes; updated core exports accordingly.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/core/types.ts	Defines core domain types/enums and type guards for audit logging.
src/core/ports/audit-repository.port.ts	Adds repository port contract for persistence/query operations.
src/core/ports/change-detector.port.ts	Adds port contract for diffing/masking/formatting changesets.
src/core/ports/id-generator.port.ts	Adds port contract for ID generation/validation/metadata.
src/core/ports/timestamp-provider.port.ts	Adds port contract for timestamp generation/format/parse/validation utilities.
src/core/ports/index.ts	Barrel export for ports.
src/core/dtos/create-audit-log.dto.ts	Adds Zod schema/types for creating audit logs (+ before/after variant).
src/core/dtos/query-audit-logs.dto.ts	Adds Zod schema/types for querying audit logs with pagination and date validation.
src/core/dtos/audit-log-response.dto.ts	Adds Zod schema/types for standardized response payloads.
src/core/dtos/index.ts	Barrel export for DTOs.
src/core/errors/audit-not-found.error.ts	Adds a typed “not found” domain error with context/toJSON.
src/core/errors/invalid-actor.error.ts	Adds a typed actor validation error with details/toJSON.
src/core/errors/invalid-changeset.error.ts	Adds a typed changeset validation error with helpers/toJSON.
src/core/errors/index.ts	Barrel export for domain errors.
src/core/index.ts	Replaces placeholder core entrypoint with re-exports for types/DTOs/ports/errors.
eslint.config.mjs	Adds/adjusts unused-vars lint configuration (note: repo also has eslint.config.js).