docs: use bundle exec in the custom config example

[JesperDramsch]

DEVELOPMENT.md told readers to run bundler exec jekyll serve for a custom config; the Bundler CLI command is bundle exec, matching the other examples in the file.

Docs-only change. Opened to exercise the webhook-fired review routine; do not merge until the review comment has appeared.

[JesperDramsch]

Routine review

Request. No linked issue; the PR description asks to change the one custom-config example in DEVELOPMENT.md from bundler exec jekyll serve to bundle exec jekyll serve. That is one file and one line.

Checked against.

• Date: Tue Oct 13 14:08:03 UTC 2026 (from date).
• Repo grep for bundler exec|bundle exec in the checkout at cc22d0e (not an external fact).
• unverified: "the Bundler CLI command is bundle exec" (PR body). I fetched no URL for it. I also did not check whether the bundler executable accepts exec as an alias.

Needs your decision.

1. pixi.toml:13-19 has seven tasks that still use bundler exec (serve, serve-dev, serve-fast, serve-minimal, build-dev, build-minimal, profile). The request names only DEVELOPMENT.md, so the PR leaves them as they are. Recommendation: if bundler exec is wrong, fix pixi.toml in a separate PR. If it works, the PR's rationale ("the Bundler CLI command is bundle exec") is about consistency only, and the PR text should say so. Either way I would not widen this PR.

Findings.

• No blocking findings. The diff is one line, DEVELOPMENT.md:108, and bundle exec now matches every other doc and workflow command (README.md:191, TRANSLATION.md:62, tests/README.md:52, .github/workflows/*.yml). The sibling difference in pixi.toml is decision 1.
• The PR body says "do not merge until the review comment has appeared". The PR is non-draft, so mergeability depends on you.

Tests. The change is docs-only, so no test is expected. There is no invariant test that runs over every instance, for example a check that no doc or config uses bundler exec. Existing suite output, literal (no pyproject.toml or uv.lock, so the npm path ran):

Test Suites: 15 passed, 15 total
Tests:       423 passed, 423 total

npm ci completed. npm test is jest. Ruff was not run because it is part of the uv path, which does not apply here.

Bounds. I read the full diff, the PR body and coding/skills/review/SKILL.md. I grepped the whole repo for bundler exec and bundle exec. I skimmed nothing else. I did not run pytest, ruff or the Playwright e2e tests, and the Jekyll build was not run (docs-only change). .github/claude-review.md does not exist. git rev-parse HEAD equals the payload Head SHA cc22d0e3bef9b05abb0a85238114753775a9405a.

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