v1.45.0: external review of v1.44.8 — R2-1, R2-2, R2-3

R2-1 (high): plan replacement committed filesystem state before the config CAS.
The upload wrote the final name and unlinked the other extension, so a rejected
config write left the live plan already replaced — or the stored config
pointing at a deleted file. Uploads now go to <space>.<token>.<ext> and delete
nothing; houseplan/plan/cleanup runs only after the config write is accepted.
The '.' separator is load-bearing: a space id cannot contain one, so cleaning
'f1' can never reach the files of 'f1-attic'.

R2-2: the backend signs at most MAX_SIGN_PATHS (200) per request and ignores
the rest silently, while the card sent its whole cache in one call and trusted
any cached entry forever — past 200 attachments the later ones stopped being
refreshed and expired for good. Requests are chunked to the shared constant,
entries carry their issue time (aging urls keep rendering while a replacement
is fetched, expired ones are dropped), and the cache is pruned to urls the live
config still references.

R2-3: areaClimate() rescanned the whole registry per room and per measurement.
areaClimateMap() classifies once and returns Map<area,{temp,hum}>, memoized on
hass identity so fresh states are always observed. Smoke measurement: 133
registry scans per update with 44 rooms before, 2 after, flat in room count.

Also: smoke_ux_fixes wrote its screenshot to a hard-coded /tmp path and could
not run on Windows.

Tests: smoke_plan_upload_reject, smoke_sign_cap, smoke_climate_once (all fail
on v1.44.8), three backend tests for versioned plan names and cleanup scoping,
unit tests for chunk/referencedContentUrls and areaClimateMap.
Docs: CHANGELOG.md + CHANGELOG.ru.md + ARCHITECTURE.md + TESTING.md + STATUS.md.

custom_components/houseplan/const.py

@@ -11,9 +11,14 @@ PLANS_DIR = "houseplan/plans"  # relative to the HA configuration directory
 FILES_URL = "/houseplan_files/files"
 # authenticated read path (audit B1): /api/houseplan/content/<plans|files>/<sub>/<name>
 CONTENT_URL = "/api/houseplan/content"
+
+# How many paths one houseplan/content/sign call may carry. The card batches to
+# the same number; a client that sends more used to get a partial answer with no
+# way to tell which paths were dropped (review R2-2).
+MAX_SIGN_PATHS = 200
 FILES_DIR = "houseplan/files"
 CONF_ADMIN_ONLY = "admin_only"
-VERSION = "1.44.8"
+VERSION = "1.45.0"
 
 DEFAULT_CONFIG: dict = {
     "spaces": [],