feat!: installation only from a release, into an empty folder; upstream merge/verify and private-instance.md removed, dist adopt, shell-neutral instructions (#153)

Files changed:
- .gitea/workflows/ci.yml
- .gitea/workflows/release.yml
- AGENTS.md
- CHANGES.md
- DEVELOPMENT.md
- EVALS.md
- INSTALL.md
- README.md
- VERSION
- docs/ownership-and-templates.md
- instructions/CONTRACT.md
- instructions/bootstrap.md
- instructions/dev/dev-setup.md
- instructions/dev/stack-dev/SKILL.md
- instructions/gates.md
- instructions/ingest-large-tree.md
- instructions/kb-profiles.md
- instructions/mcp-read-server.md
- instructions/migrations/3.0.0-authoring-conventions.md
- instructions/preflight.md
- instructions/private-instance.md
- instructions/session-setup.md
- instructions/setup-instance.md
- instructions/upgrade-instance.md
- tools/CONTRACT.md
- tools/README.md
- tools/chemenu/cli.py
- tools/chemenu/cli_contract.py
- tools/chemenu/commands/dist_cmd.py
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/git_publish.py
- tools/chemenu/commands/upstream_cmd.py
- tools/chemenu/commands/work_cmd.py
- tools/chemenu/config.py
- tools/chemenu/ownership.py
- tools/chemenu/tests/test_cli.py
- tools/chemenu/tests/test_dist_cmd.py
- tools/chemenu/tests/test_instructions_shell.py
- tools/chemenu/tests/test_preflight.py
- tools/chemenu/tests/test_preflight_pwsh.py
- tools/chemenu/tests/test_run_budget.py
- tools/chemenu/tests/test_upstream_cmd.py
- tools/chemenu/toc.py
- tools/preflight.ps1
- tools/preflight.sh

.gitea/workflows/ci.yml

@@ -75,7 +75,8 @@ jobs:
       # working tree stays clean for the ignore-rule checks.
       WIKITOOL_SESSION_ID: ci-${{ github.run_id }}
       WIKI_TRACE_DIR: /tmp/wikitool-trace
-      DIST_DIR: /tmp/dist
+      BUILD_DIR: /tmp/build
+      INSTANCE_DIR: /tmp/instance
 
     steps:
       - name: System dependencies
@@ -235,15 +236,24 @@ jobs:
           echo 'Then `docs verify` holds VERSION and CHANGES.md together.'
           exit 1
 
-      - name: Export the distribution
-        run: tools/wikitool dist export "$DIST_DIR"
+      - name: Build a release tarball
+        # The same form release.yml builds - a `dist export` tree under exactly one
+        # top-level folder, plus its .sha256 - so the replay below starts where a
+        # user starts: from the archive, not from an exported tree.
+        run: |
+          set -eu
+          name=chemenu-stack-ci
+          mkdir -p "$BUILD_DIR"
+          tools/wikitool dist export "${BUILD_DIR}/${name}"
+          tar -czf "${BUILD_DIR}/${name}.tar.gz" -C "$BUILD_DIR" "$name"
+          ( cd "$BUILD_DIR" && sha256sum "${name}.tar.gz" > "${name}.tar.gz.sha256" )
 
       - name: The distribution works as a fresh instance
-        # Replays instructions/setup-instance.md end to end, minus its four
-        # interactive decision points. What this tests is the release artifact
-        # as an artifact: the documented path from an unpacked export to a
-        # verified instance. Running one `instructions verify` against the
-        # export would only have re-checked the file it just copied.
+        # Replays instructions/setup-instance.md end to end, minus its interactive
+        # decision points. What this tests is the release artifact as an
+        # artifact: the documented path from the preflight asset in an empty
+        # folder to a verified instance. Step 0 runs the asset with --archive
+        # instead of a download, which is the one difference from a real install.
         #
         # Personalization is stubbed the same way the identity is: the real
         # step interviews the user, so CI substitutes a fixed answer - here,
@@ -253,7 +263,13 @@ jobs:
         # what a person would write into them.
         run: |
           set -eu
-          cd "$DIST_DIR"
+          mkdir -p "$INSTANCE_DIR"
+          cp tools/preflight.sh "$INSTANCE_DIR/preflight.sh"
+          cd "$INSTANCE_DIR"
+          sh preflight.sh --archive "${BUILD_DIR}/chemenu-stack-ci.tar.gz"
+          # Installed in place: the asset is gone, the tree is here.
+          test ! -e preflight.sh
+          test -f tools/preflight.sh
           git init -q -b main
           git config user.name "CI Instance"
           git config user.email "ci@example.invalid"
@@ -267,18 +283,7 @@ jobs:
           # contracts are adopted verbatim - the shipped text is a working
           # default, unlike a personalization file.
           grep -v 'wikitool:template-unfilled' kb/CONVENTIONS.md.template > kb/CONVENTIONS.md
-          for template in kb/*/COLLECTION.md.template types/*.template; do
-            cp "$template" "${template%.template}"
-          done
-          # A fresh instance refuses to run before its preflight (exit 42), so
-          # this proves both halves: the refusal, then the setup that ends it.
-          set +e
-          tools/wikitool doctor > /tmp/before-preflight.txt 2>&1
-          refused=$?
-          set -e
-          test "$refused" -eq 42
-          grep -q 'tools/preflight.sh' /tmp/before-preflight.txt
-          tools/preflight.sh
+          tools/wikitool dist adopt
           tools/wikitool instructions sync
           tools/wikitool index rebuild
           tools/wikitool sources rebuild-index
@@ -306,7 +311,7 @@ jobs:
         # The unit tests cover what it collects; this covers that it arrives.
         run: |
           set -eu
-          cd "$DIST_DIR"
+          cd "$INSTANCE_DIR"
           python3 tools/bugreport.py --no-trace
           bundle=$(ls -d reports/bugreport-*/ | head -n 1)
           test -f "$bundle/MANIFEST.md"