* Bump version

* Ignore grepai cache directory

Prevent local grepai indexes from appearing in the working tree.

* Document async step function decision

Add ADR 005 to capture the rationale for keeping steps synchronous\nwhile running scenarios on tokio-current-thread.\n\nNormalise the execplan example table after running the documentation\nformatter.

* Document async step limitation

Add a known-issues entry describing the current async step\nconstraints and reference ADR-005 for the interim strategy\nuntil the StreamEnd and CodecStateful migrations land.

* Clarify async step guidance

Explain the recommended async pattern for synchronous steps,\nincluding async fixtures and per-step runtimes, and link\nthe guidance to ADR-005 and ADR-001 for rationale.

* Align async test guidance

Remove async-std test references in the users guide to\nmatch the Tokio-only limitation for async scenarios.

* Consolidate migration guidance

Accept ADR-005 with migration and rationale sections, update\nlanguage to remove pronouns, and align async guidance with\nTokio-only constraints.\n\nIntroduce a canonical cucumber-rs migration and async pattern\nreference and link it from the users guide.

* Update ADR phases and rationale

Revise ADR-005 migration phases and architectural rationale\nper the requested structure, and align the users guide wording\nwith -ize spelling.

* Refine async guidance phrasing

Adjust the users guide sentence flow in the async pattern\nsection to read cleanly while preserving the canonical link.