fix(ci): release attaches files only; dev-release requires a dev-cycle version

[garycoding]

Two CI fixes surfaced by the first v0.8.0 release.

1. release-electron.yml — directory in the asset glob (real bug)

The "Create GitHub Release" step did files=(artifacts/**/*) with globstar, which expands to the per-OS directories (artifacts/installers-macos-latest, …) as well as the files inside. gh release create rejects a directory:

read artifacts/installers-macos-latest: is a directory

…and rolls the release back, so v0.8.0 published with no installers attached (recovered by hand). Fixed by filtering to regular files:

files=()
for f in artifacts/**/*; do [[ -f "$f" ]] && files+=("$f"); done

2. dev-release-electron.yml — require a -dev version (hardening)

The dev-release builds from "whatever develop carries." When develop sits at a plain release version (as conception-space did before the 0.8.1-dev0 cycle was opened), the dev build is versioned identically to a real release — same filename, same About-box version — so you can't tell a pre-flight from the real thing. New gate fails early:

::error:: package.json version '0.8.0' has no -dev marker; the build would be
indistinguishable from a release. Open a dev cycle first: git dev-release --open

Comment updated to match (it never needed a unique counter, but it does need a -dev marker).

No app/behaviour change; version stays 0.8.1-dev0. The same two fixes will go to the handbook Electron templates in a follow-up PR.

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