docs(changelog): add v0.4.34 release entry (2026-08-25) (MUL-6670) (#7539)

* docs(changelog): add v0.4.34 release entry (2026-08-25) (MUL-6670)

Co-authored-by: multica-agent <github@multica.ai>

* docs(changelog): rewrite v0.4.34 entry copy for clarity (MUL-6670)

Co-authored-by: multica-agent <github@multica.ai>

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Co-authored-by: Sol-Boy <sol-boy@multica-ai.local>
Co-authored-by: multica-agent <github@multica.ai>
Co-authored-by: J <bohan@devv.ai>