Add the local project, framework submodule, hooks and templates

After the repositories and the mirror, the script now creates the local
project: the directory, git on main, credential-free origin (and github)
remotes, and the license history from Gitea. Then it adds the framework as
a submodule over SSH, installs its skills and git hooks once (plan gate
optional), and copies the AGENTS.md and artifact registry templates.

Nothing is overwritten without a yes: an existing directory, core.hooksPath,
AGENTS.md or docs/artifact-registry.md each ask first (default no). Without
SSH the framework steps can only be skipped, after a yes. No commit is made
in the new project. New optional config key FRAMEWORK_REPO.

New library files git.sh, localproject.sh and framework.sh. Tests run real
git against local bare repositories that stand in for Gitea and the
framework, with a private git configuration (769 checks). The README is now
the full guide.

Task: MIL-003#1
Task: MIL-003#2
Task: MIL-003#3
Task: MIL-003#4
Task: MIL-003#5
Refs #15
Refs #16
Refs #17
Refs #18
Refs #19

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

tests/test-hosts.sh

@@ -264,6 +264,9 @@ test_apply_declined_creates_nothing() {
 
 test_apply_for_user_owners_uses_the_user_endpoints() {
   setup_hosts
+  # The Gitea account's own repository (with the license commit) is a copy.
+  mkdir -p "$WORK/remote/gitea-user"
+  cp -R "$WORK/remote/TirSystem/my-app.git" "$WORK/remote/gitea-user/my-app.git"
   write_routes <<'ROUTES'
 GET|/api/v1/user|200|{"login":"gitea-user"}
 GET|/api/v1/licenses|200|[{"key":"AGPL-3.0"}]