docs(changelog): #5780 open state.db read-only for lineage reads + watcher

CHANGELOG.md

@@ -5,6 +5,8 @@
 
 ### Fixed
 
+- **Session-lineage reads and the gateway session-list watcher now open the agent's `state.db` read-only.** Reading session lineage/parent-child metadata and the watcher's cheap change-fingerprint opened a *writable* SQLite handle on the live, potentially multi-GB WAL `state.db` while the agent was streaming into it — adding needless checkpoint/lock surface to a pure read. These three read paths now open a read-only (`mode=ro`) connection, falling back to a writable one (with a warning) only if the read-only open fails on an exotic filesystem, and raising rather than letting the fallback create an empty "ghost" `state.db` at a missing path. Same rationale as the #5455 session-listing read-only path. Thanks @ai-ag2026. (#5780, #5455)
+
 - **The MCP servers/tools list now reflects the active profile instead of the default one.** When viewing MCP servers or tools while a non-default profile was active, the list was read from the ambient (default) profile's config rather than the profile you were actually in, so it could show the wrong profile's MCP servers. Both the server-list and tool-list reads are now scoped to the active profile's config home, matching where the MCP write handlers save. Deployments that point config at an external path via `HERMES_CONFIG_PATH` now also read that override consistently on the active-home path. Thanks @rodboev. (#5772, #5619)
 
 - **Mobile/touch: the chat no longer jumps backward while a reply streams and you're scrolled up reading history (non-virtualized transcripts).** Companion to the desktop and virtualized fixes (#5637/#5638/#5742) for the one code path they didn't cover: with transcript virtualization turned off (#4325 opt-out), a re-render rebuilt every row from scratch, and a fresh off-screen tall user row under `content-visibility: auto` (active on coarse-pointer devices) reserved only its flat placeholder height instead of its real height — so `scrollHeight` shrank, the browser clamped `scrollTop`, and the viewport jumped toward the top. The rebuild now reserves each user row's real height, measured from the still-laid-out rows just before the wipe (with a CJK-aware estimate as the backstop for never-painted rows and a `max(remembered, estimate)` floor so a partial paint can't under-reserve). Desktop is unchanged (the placeholder is inert there). Thanks @allenliang2022. (#5751, #5744)