sce v0.4.0-pre-alpha-v9

CLI release assets

• Canonical sce archives are published as sce-v<version>-<target-triple>.tar.gz
• Per-archive SHA-256 checksum files are published as sce-v<version>-<target-triple>.tar.gz.sha256
• Combined artifact metadata is published as sce-v<version>-release-manifest.json
• Combined artifact manifest signatures are published as sce-v<version>-release-manifest.json.sig
• Combined checksums are published as sce-v<version>-SHA256SUMS
• The npm package tarball is published as sce-v<version>-npm.tgz
• Flatpak source-built packaging metadata is published as sce-v<version>-flatpak-manifest.tar.gz, with matching .sha256 and .json metadata assets; this is not a prebuilt Flatpak app or Flathub publication.
• Flatpak source-built .flatpak bundles are published as sce-v<version>-x86_64.flatpak and sce-v<version>-aarch64.flatpak, with matching .sha256 and .json metadata assets; install directly with flatpak install --user <url>.

What's Changed

• Claude background shell mutation-scope by @davidabram in #295
• Feat: Update skill generation for new model architecture by @ivke995 in #294
• Retire diff_traces remote sync by @davidabram in #293
• mutation-cursor NeverSeen attribution fix by @davidabram in #296
• failure-kind health invariant by @davidabram in #297
• Agent Trace DB write contention by @davidabram in #299

Full Changelog: v0.4.0-pre-alpha-v8...v0.4.0-pre-alpha-v9