PR #119 merged: chore: v3.4.0 release prep — changelog backfill, drop Laravel 11, fix version claims

Gets the repo ready to tag v3.4.0 (main has ~39 unreleased commits incl. the #109/#115 security hardening; note v3.3.0 has a git tag but was never published as a GitHub release).

• CHANGELOG backfill — entries stopped at 3.0.0 and the [Unreleased] block still described the multi-env work that shipped in 3.1.0. Added 3.1.0 → 3.3.0 sections from the git history and wrote the 3.4.0 section, including the regenerate your nginx.conf upgrade note.
• Drop Laravel 11 from the illuminate constraints — it's been untested since the CI matrix moved to 12/13; claiming support without testing is worse than not claiming it. Laravel 11 apps simply stay on v3.3.x.
• Version claims fixed — README badge + requirements, docs pages, CLAUDE.md said "PHP 8.2+, Laravel 11/12" while composer requires ^8.3 and CI tests 12/13 on 8.3–8.5.

Full pest suite green after re-resolving deps against the new constraints (273 passed). Merge after #117/#118, then tag v3.4.0.