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/run-tests.sh

@@ -68,6 +68,7 @@ for test_file in "$TEST_DIR"/test-*.sh; do
   done < <(declare -F | awk '$3 ~ /^test_/ {print $3}')
 done
 
+remove_shared_remotes
 printf '\n%d checks, %d failed, %d static check(s) failed\n' \
   "$TESTS_RUN" "$TESTS_FAILED" "$failed_checks"
 if ((TESTS_FAILED > 0 || failed_checks > 0)); then