build(flatpak): net.catcrafts.CrafterReview on the Crafter.Build base

The manifest builds on the Crafter.Build Flatpak (base:
net.catcrafts.CrafterBuild): its crafter-build, LLVM 23 and libc++
compile this project inside flatpak-builder, and crafter-build test runs
there too. Node 24.22.0 (for the Playwright MCP server) and a static
ripgrep 15.2.0 are bundled, pinned by sha256; claude is not, being
proprietary. finish-args: the network, the host's files and /tmp, and
gnupg's keyboxd socket only, never the agent.

The base's files belong to no module of this manifest, so `cleanup` does
not reach them: prune-base.sh keeps a named list (the binary, Node, rg,
the libc++ the binary links, share/crafter-review, this app's metainfo
and licences) and removes the rest, whatever a newer base adds.

`crafter-build run flatpak [--base=<branch>] [--jobs=N]` builds it and
smoke-tests --version and ldd through `flatpak build`; `run install`
installs it as the `local` branch. Until a Crafter.Build release with
scripts is on stable, `--base=local` builds against Crafter.Build's own
local install, from a gitignored manifest copy whose cache is its own.
Built that way: 4 tests green in the sandbox, the charter sha256s the
native build prints, no library missing, RUNPATH /app/lib only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -5,4 +5,4 @@ lib/*.a
 # written next to the manifest: by CI with the version stamped in, and by
 # `crafter-build run flatpak --base=<branch>` for a local base branch
 packaging/flatpak/ci-manifest.yaml
-packaging/flatpak/local-base.yaml
+packaging/flatpak/*-base.yaml