stack: Telemetrie-Default nach Installationsform, Byte-Deckel und Session-Retention (schliesst #55)

Files changed:
- .gitea/workflows/ci.yml
- .gitignore
- CHANGES.md
- EVALS.md
- INSTALL-MCP.md
- INSTALL.md
- VERSION
- instructions/setup-instance.md
- reports/CONTRACT.md
- tools/CONTRACT.md
- tools/chemenu/commands/doctor.py
- tools/chemenu/config.py
- tools/chemenu/mcp/server.py
- tools/chemenu/telemetry/policy.py
- tools/chemenu/telemetry/schema.py
- tools/chemenu/telemetry/writer.py
- tools/chemenu/tests/conftest.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_mcp_server.py
- tools/chemenu/tests/test_telemetry_emit.py
- tools/chemenu/tests/test_telemetry_policy.py
- tools/chemenu/version.py

tools/chemenu/version.py

@@ -51,7 +51,8 @@ CHANGES_FILENAME = "CHANGES.md"
 # Written into an exported distribution by `dist export`, and committed with
 # it: an instance has to keep knowing which stack it came from, or update
 # detection has nothing to compare against. Machine-written, never hand-edited.
-RELEASE_STAMP_FILENAME = ".wikitool-release.json"
+# Defined in `config.py`, not here - see that constant's own comment.
+RELEASE_STAMP_FILENAME = config.RELEASE_STAMP_FILENAME
 STAMP_SCHEMA = 1
 
 # Where `version check` looks when neither the environment nor a release stamp