chore: bump version to v1.5.4

fix: resolve clippy warnings and formatting issues (#19)

style: cargo fmt

v1.5.3: Fix write pipeline, WAL concurrency, --read-only mode (#18)

docs: add engraph logo to README

docs: update README title and intro for v1.5

docs: add comprehensive ChatGPT Actions setup guide to README

fix(openapi): add empty schemas object to components (ChatGPT requirement)

fix(http): CORS credentials incompatible with wildcard headers

chore: bump version to 1.5.0

Merge pull request #17 from devwhodevs/feature/v1.5-chatgpt-actions

docs: update CLAUDE.md, README, CHANGELOG for v1.5

fix: apply cargo fmt for v1.5

feat(cli): add --setup-chatgpt interactive helper

feat(http): serve OpenAPI spec and ChatGPT plugin manifest (no auth required)