Merge dev into main

[WaylandYang]

Brings main up to date with dev: the 22 changes merged since #1069, ahead of the 0.1.0-rc8 release.

• Sources and query engines: a ClickHouse warehouse can be mounted read-only (A ClickHouse warehouse can be mounted read-only, with slow queries stopped by the server timeout or KILL QUERY #1094, migration 0106). Notion imports keep nested blocks and table cells, and a page that cannot be read no longer replaces its stored body (Read nested Notion blocks in page order #1085, Preserve Notion page bodies on read failures and import table cells #1101). The GCS path has been run against a real bucket (Record the real GCS run and guard the console-folder path in its test #1091). The Token dialog shows a Statements source its own push URL (The token dialog shows a statements source its own push URL, not the one for documents #1111).
• Time: a pushed statement's complete date or zoned timestamp is resolved in code, with no chat model (Resolve pushed structured dates and timestamps without a chat model #1090). Time mentions resolve whatever order the model lists them in (Resolve time mention dependencies independently of model reply order #1087). A quote is found across a line break in a PDF passage, and a deck's cover date attests every slide (A quote and its time words are found across a line break in the passage #1081, A deck's first slide opens the deck, so the date on its cover attests every slide #1082).
• Identity and alignment: a pair that was kept apart is not queued again on the next mention (A pair that was kept apart is not queued again the next time either entity is mentioned #1113). The signature queries make one pass, and signatures are not embedded while no property has a vector (List phrase signatures and kind words in one pass instead of rescanning the base once per group #1108, Skip embedding signatures and kind words when no property has a vector to compare them with #1107). Degree and fact counts are scoped to their base (Scope entity degree and fact count subqueries to their knowledge base across store queries #1072, Scope merge direction fact counts to each entity's knowledge base #1078).
• Ontology and interface: an empty ontology says what the documents still need (An empty ontology says what the documents still need, and no longer claims to cover them #1083). Ontology views aggregate usage counts in one query (Aggregate entity and relation usage counts in ontology views to avoid correlated table scans #1088). Notification streams reconnect after broadcast lag (Reconnect notification streams after broadcast lag to recover missed updates #1080). Extraction failure reasons are stored in English (Write extraction failure diagnostics in English #1112).
• Parsing, export and API: PPTX merged table cells keep their content (Read PPTX merge attributes from table cells to preserve merged content #1077). RDF export writes numbers and dates in valid XSD forms (Export number and date attributes with valid XSD lexical forms #1086). An invalid token expiry is refused before the token is issued (Reject invalid personal access token expiration before issuance #1084).
• Bench: an empty SQL field no longer scores as zero (Keep empty SQL fields out of numeric benchmark scores #1102).

Merge with a merge commit, not a squash.

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