session: Harness-Session-Variable schliesst die Luecke im Session-Id-Fallback (Telemetrie-Join, Iteration-Budget-Gate); SIGPIPE-Nebenbefund im Emitter behoben

Files changed:
- CHANGES.md
- EVALS.md
- INSTALL.md
- VERSION
- instructions/session-setup.md
- tools/CONTRACT.md
- tools/chemenu/cli.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/run_budget.py
- tools/chemenu/session.py
- tools/chemenu/telemetry/writer.py
- tools/chemenu/tests/conftest.py
- tools/chemenu/tests/test_cli.py
- tools/chemenu/tests/test_run_budget.py
- tools/chemenu/tests/test_telemetry_emit.py

tools/chemenu/commands/doctor.py

@@ -24,6 +24,7 @@ from chemenu import config, conventions, kb_collections, version as version_mod
 from chemenu.commands import git_publish, instructions_cmd
 from chemenu.commands._util import rel_path
 from chemenu.session import ENV_VAR as SESSION_ENV_VAR
+from chemenu.session import session_id_source as _session_id_source
 
 console = Console()
 
@@ -414,12 +415,23 @@ def check_upload_intake() -> Check:
 
 
 def check_session_id() -> Check:
+    """Three-valued, not two: an explicit `WIKITOOL_SESSION_ID` and a
+    recognised harness variable (see `chemenu.session.HARNESS_ENV_VARS`) both
+    keep a session's calls in one telemetry/budget bucket, so both are `OK`.
+    Only the `getppid()` fallback - a fresh "session" on every call, on a
+    harness that runs each tool call in its own shell - is a `WARN` (see
+    Gitea #110)."""
     import os
 
     if os.environ.get(SESSION_ENV_VAR, "").strip():
         return Check("session-id", "OK", f"{SESSION_ENV_VAR}={os.environ[SESSION_ENV_VAR]}")
+    source = _session_id_source()
+    if source != "getppid() fallback":
+        return Check("session-id", "OK", f"scoped by harness variable {source}")
     return Check(
-        "session-id", "WARN", f"{SESSION_ENV_VAR} is not set - budget falls back to the parent PID",
+        "session-id", "WARN",
+        f"{SESSION_ENV_VAR} is not set and no harness session variable was found - "
+        "budget falls back to the parent PID",
         "See instructions/session-setup.md",
     )
 

tools/chemenu/commands/run_budget.py

@@ -144,6 +144,27 @@ def _session_id_source() -> str:
     return _shared_session_id_source()
 
 
+def _entry_for(state: dict, session_id: str) -> dict:
+    """The state entry for this session id, starting a fresh counter if the
+    same id string now carries a different origin than the one that wrote it.
+
+    Two different id spaces (a `getppid()` integer, a harness UUID, an
+    explicit `WIKITOOL_SESSION_ID`) are vanishingly unlikely to collide as
+    strings - but "unlikely" is not "impossible", and inheriting a stranger's
+    count on collision is exactly the silent mis-key #110 exists to close.
+    An entry written before this field existed carries no `source` at all and
+    is treated as compatible: it keeps its count rather than being reset the
+    first time this ships, which would throw away real, in-flight state.
+    """
+    source = _session_id_source()
+    entry = state.get(session_id)
+    if entry is None or (entry.get("source") is not None and entry["source"] != source):
+        entry = {"count": 0, "recent": []}
+        state[session_id] = entry
+    entry.setdefault("source", source)
+    return entry
+
+
 def _load_state() -> dict:
     if not STATE_FILE.exists():
         return {}
@@ -247,7 +268,7 @@ def record_and_check(
     with _state_lock():
         session_id = _session_id()
         state = _load_state()
-        entry = state.setdefault(session_id, {"count": 0, "recent": []})
+        entry = _entry_for(state, session_id)
         recent = entry["recent"]
 
         call_signature = f"{command} {' '.join(args)}".strip()