Root cause (task 01): none of C1-C3 - in Chromium 151 (real mode) a
merely-hidden tab neither stops the stream (frames arrive at full rate;
turn completes) nor fires pagehide on tab switch; C1's double-record
path was proven latent via a synthetic pagehide (trigger is
browser-dependent, e.g. Safari) and C2 (the 120s pre-token guard) was
confirmed to fire while hidden.
- C1: the pagehide partial-persist is correlated with the turn's settle
(leavePartialIndex) - the done/stop settle REPLACES it in place
(identity-guarded rememberBrainTurn in-place mode), so bor.chat.v1
and the auto-saved saved_chats row keep exactly ONE brain turn per
question; a real navigation never runs a settle, so the leave-save
is unchanged.
- C2: the visibility re-arm gives the still-armed pre-token guard a
fresh TURN_TIMEOUT_MS when the tab returns to visible - hidden time
no longer counts toward the 120s guard.
- Phase-48 teardown contract untouched: Stop / tab close / real
navigation still cancel the fetch and stop the model.
- Unit pins: tests/unit/test_frontend_hidden_tab.py (the app.js
mechanisms without a browser).
- E2E pins: tests/e2e/test_hidden_tab_stream.py - synthetic pagehide
mid-stream completes exactly once with one brain turn (localStorage
+ auto-saved row), reload restores one bubble, no-event baseline,
and the fake-clock pre-token guard re-arm (discriminating: fails
with the re-arm disabled).
Standardize on the .agents/ directory (shared with project skills):
phases/, user_stories/, reports/, screenshots/, validate.sh, and
phase-sessions/ + pipeline.log all move to .agents/ (git mv preserves
history; runtime artifacts move alongside).
Updates every reference in AGENTS.md, README.md, .gitignore, app
docstrings, and test story headers. Historical KB content in data/
and the runtime pipeline.log transcript are left untouched.
ducoterra