Add the RepoFoundry foundation: config parsing, HTTP helper, prompts, tests

create-project.sh validates config.env and .env (parsed, never sourced),
checks the required tools, asks for the project details and prints a
summary. It makes no network call and no change on disk yet.

- config.env.example and .env.example hold placeholders only
- tokens go through a private curl config file, never the command line
- tests run in private directories with a stub curl; shellcheck and shfmt
  are part of tests/run-tests.sh

Task: MIL-001#1
Task: MIL-001#2
Task: MIL-001#3
Task: MIL-001#4
Task: MIL-001#5
Task: MIL-001#6
Closes #3
Closes #4
Closes #5
Closes #6
Closes #7
Closes #8

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

tests/test-prompts.sh

@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+# test-prompts.sh - tests for the interactive prompts and their validation
+# (MIL-001 task: prompts). Answers are piped to stdin. Sourced by
+# run-tests.sh.
+
+# shellcheck disable=SC2016  # snippet and fixture text is literal on purpose
+test_prompt_value_asks_again_until_valid() {
+  run_lib $'bad name\n..\nok-name\n' \
+    'prompt_value "Repository name" "" is_valid_repo_name "use letters"; echo "[$REPLY]"'
+  assert_status "retries" 0 "$STATUS"
+  assert_eq "valid answer returned" "[ok-name]" "$OUT"
+  assert_contains "told why" "$ERR" "invalid Repository name: use letters"
+}
+
+test_prompt_value_uses_the_default() {
+  run_lib $'\n' \
+    'prompt_value "Local directory" "./proj" is_valid_directory "x"; echo "[$REPLY]"'
+  assert_eq "default taken" "[./proj]" "$OUT"
+}
+
+test_prompt_stops_when_input_ends() {
+  run_lib "" 'prompt_value "Repository name" "" is_valid_repo_name "x" </dev/null'
+  assert_status "end of input" 1 "$STATUS"
+  assert_contains "message" "$ERR" "no input available for 'Repository name'"
+}
+
+test_prompt_choice() {
+  run_lib $'PUBLIC\n' 'prompt_choice "Visibility" private private public; echo "[$REPLY]"'
+  assert_eq "case-insensitive choice" "[public]" "$OUT"
+  run_lib $'\n' 'prompt_choice "Visibility" private private public; echo "[$REPLY]"'
+  assert_eq "default choice" "[private]" "$OUT"
+  run_lib $'secret\nprivate\n' 'prompt_choice "Visibility" private private public; echo "[$REPLY]"'
+  assert_eq "invalid then valid" "[private]" "$OUT"
+  assert_contains "told the options" "$ERR" "choose one of private public"
+}
+
+test_prompt_yes_no() {
+  local answer expected
+  while IFS='|' read -r answer expected; do
+    run_lib "$answer"$'\n' 'prompt_yes_no "Use GitHub" y; echo "[$REPLY]"'
+    assert_eq "answer '$answer'" "[$expected]" "$OUT"
+  done <<'EOF'
+|1
+y|1
+YES|1
+n|0
+No|0
+EOF
+  run_lib $'maybe\nn\n' 'prompt_yes_no "Use GitHub" y; echo "[$REPLY]"'
+  assert_eq "invalid then valid" "[0]" "$OUT"
+  assert_contains "told what to answer" "$ERR" "answer y or n"
+}
+
+test_collect_details_with_github() {
+  run_lib $'my-app\nA test app\npublic\nTirSystem\ny\nmy-org\n\ny\n' \
+    'collect_project_details
+for k in name description visibility gitea_owner use_github github_owner directory plan_gate; do
+  printf "%s=%s\n" "$k" "${PROJECT[$k]}"
+done'
+  assert_status "details collected" 0 "$STATUS"
+  assert_eq "details" $'name=my-app\ndescription=A test app\nvisibility=public\ngitea_owner=TirSystem\nuse_github=1\ngithub_owner=my-org\ndirectory=./my-app\nplan_gate=1' "$OUT"
+}
+
+test_collect_details_without_github() {
+  run_lib $'my-app\n\n\nTirSystem\nn\n\nn\n' \
+    'collect_project_details
+printf "%s|%s|%s|%s\n" "${PROJECT[visibility]}" "${PROJECT[use_github]}" "[${PROJECT[github_owner]}]" "${PROJECT[plan_gate]}"'
+  assert_status "GitHub skipped" 0 "$STATUS"
+  assert_eq "defaults and no GitHub owner" "private|0|[]|0" "$OUT"
+  assert_not_contains "no GitHub owner prompt" "$ERR" "GitHub owner"
+}
+
+test_github_user_is_a_default_not_the_owner() {
+  # GITHUB_USER only pre-fills the prompt; the Maintainer can pick an
+  # organization instead.
+  run_lib $'my-app\n\n\nTirSystem\ny\n\n\nn\n' \
+    'CREDENTIALS[GITHUB_USER]=octo-user
+collect_project_details
+echo "${PROJECT[github_owner]}"'
+  assert_eq "default is the account" "octo-user" "$OUT"
+  run_lib $'my-app\n\n\nTirSystem\ny\nacme-org\n\nn\n' \
+    'CREDENTIALS[GITHUB_USER]=octo-user
+collect_project_details
+echo "${PROJECT[github_owner]}"'
+  assert_eq "organization chosen" "acme-org" "$OUT"
+}