feat: Windows portability - path separators, LF line endings, UTF-8 decoding and output, msvcrt lock fallback (#152)

Files changed:
- .gitattributes
- CHANGES.md
- VERSION
- raw/CONTRACT.md
- tools/README.md
- tools/chemenu/commands/_util.py
- tools/chemenu/commands/dist_cmd.py
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/eval_cmd.py
- tools/chemenu/commands/git_publish.py
- tools/chemenu/commands/index_build.py
- tools/chemenu/commands/lint.py
- tools/chemenu/commands/log_append.py
- tools/chemenu/commands/migrate_cmd.py
- tools/chemenu/commands/provenance_cmd.py
- tools/chemenu/commands/raw_cmd.py
- tools/chemenu/commands/run_budget.py
- tools/chemenu/commands/upstream_cmd.py
- tools/chemenu/commands/version_cmd.py
- tools/chemenu/commands/work_cmd.py
- tools/chemenu/config.py
- tools/chemenu/corpus_cache.py
- tools/chemenu/filelock.py
- tools/chemenu/frontmatter_io.py
- tools/chemenu/kb_scan.py
- tools/chemenu/kb_state.py
- tools/chemenu/lint_core.py
- tools/chemenu/prerequisites.py
- tools/chemenu/provenance.py
- tools/chemenu/search/base.py
- tools/chemenu/search/ripgrep.py
- tools/chemenu/telemetry/writer.py
- tools/chemenu/tests/test_dist_cmd.py
- tools/chemenu/tests/test_portability.py
- tools/chemenu/tests/test_search.py
- tools/chemenu/tests/test_trace_ingest.py
- tools/chemenu/type_resolver.py
- tools/chemenu/upload.py
- tools/chemenu/version.py
- tools/run_wikitool.py
- tools/trace_ingest.py

tools/trace_ingest.py

@@ -232,7 +232,11 @@ def main() -> int:
     )
     args = parser.parse_args()
 
-    raw = sys.stdin.read() if not sys.stdin.isatty() else ""
+    # Bytes, decoded here: a harness writes its payload as UTF-8, and Python on
+    # Windows would decode `sys.stdin` with the locale's code page (Gitea #152).
+    raw = ""
+    if not sys.stdin.isatty():
+        raw = sys.stdin.buffer.read().decode("utf-8", errors="replace")
     try:
         payload = json.loads(raw) if raw.strip() else {}
     except json.JSONDecodeError:
@@ -255,6 +259,7 @@ def main() -> int:
         if errors:
             sys.stderr.write("; ".join(errors) + "\n")
             return 1
+        sys.stdout.reconfigure(encoding="utf-8")
         sys.stdout.write(json.dumps(record, ensure_ascii=False) + "\n")
         return 0