rename: the server is Inkwell — package, env vars, image, compose, export marker

Step 2 of milestone 481. The operator chose a full rename (Scribe note 5071), so
this goes past the display strings into the identities:

- src/thoughtsync → src/inkwell; every import, the Dockerfile and both compose
  commands, alembic env, pyproject
- THOUGHTSYNC_* → INKWELL_* (database URL, secret key, log level, tag/port/bind)
- container data dir /var/thoughtsync → /var/inkwell
- image git.fabledsword.com/bvandeusen/inkwell; Postgres user/db default inkwell;
  CI's integration service follows
- the files the image serves are inkwell.*. fetch-clients.sh still fetches the
  thoughtsync-named release assets, because the lanes that publish them are
  renamed in steps 3 and 4
- exports are written with app "inkwell"

Two deliberate exceptions, both because data rides on them:

- compose volumes are now named explicitly and overridable (INKWELL_DB_VOLUME,
  INKWELL_DATA_VOLUME), so a deployment installed as ThoughtSync points at the
  volumes and DB identity it already has. .env.example says exactly what to set
- import still accepts app "thoughtsync", because exports written before the
  rename are backups. Tested both ways

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

tests/test_notes.py

@@ -1,12 +1,15 @@
+import io
+import json
+import zipfile
 from datetime import datetime, timezone
 
 import pytest
 
-from thoughtsync.app import create_app
-from thoughtsync.common import coerce_bool, parse_dt
-from thoughtsync.colors import NOTE_COLORS
-from thoughtsync.models.note import Note
-from thoughtsync.notes.checklist import (
+from inkwell.app import create_app
+from inkwell.common import coerce_bool, parse_dt
+from inkwell.colors import NOTE_COLORS
+from inkwell.models.note import Note
+from inkwell.notes.checklist import (
     append_item,
     parse_items,
     remove_item,
@@ -14,13 +17,15 @@ from thoughtsync.notes.checklist import (
     set_item_text,
     strip_marker,
 )
-from thoughtsync.unfurl_queue import detect_urls
-from thoughtsync.notes import (
+from inkwell.unfurl_queue import detect_urls
+from inkwell.notes import (
+    _ImportBudget,
     _attachment_ext,
     _header_filename,
     _keep_spec,
     _native_spec,
     _note_markdown,
+    _read_import_specs,
     _safe_filename,
     _slugify,
     _usec_to_dt,
@@ -32,7 +37,8 @@ from thoughtsync.notes import (
     parse_list_items,
     parse_tags,
 )
-from thoughtsync.notes.tags import split_body_tags
+from inkwell.notes.import_export import NATIVE_APP_MARKERS
+from inkwell.notes.tags import split_body_tags
 
 
 @pytest.fixture
@@ -672,3 +678,24 @@ def test_native_spec_of_a_pre_m304_export_still_carries_its_items():
     # items at all.
     old = {"body": "shopping", "items": [{"text": "milk", "checked": True}]}
     assert _native_spec(old)["items"] == [{"text": "milk", "checked": True}]
+
+
+def _export_zip(app_marker: str) -> zipfile.ZipFile:
+    buf = io.BytesIO()
+    with zipfile.ZipFile(buf, "w") as zf:
+        zf.writestr("notes.json", json.dumps({"app": app_marker, "notes": [{"body": "kept"}]}))
+    return zipfile.ZipFile(io.BytesIO(buf.getvalue()))
+
+
+@pytest.mark.parametrize("marker", ["inkwell", "thoughtsync"])
+def test_an_export_imports_under_either_name(marker):
+    # "thoughtsync" is what every export written before the rename to Inkwell says.
+    # Those zips are backups, so they have to keep restoring as native exports rather
+    # than falling through to the Keep importer, which would find nothing in them.
+    specs, source = _read_import_specs(_export_zip(marker), _ImportBudget())
+    assert source == "inkwell"
+    assert [s["body"] for s in specs] == ["kept"]
+
+
+def test_new_exports_are_written_as_inkwell():
+    assert NATIVE_APP_MARKERS[0] == "inkwell"