[KAVentures]

Explicit private-browser markers such as Chrome's Swedish/German (Inkognito) were not covered by the English exclusion rules. A fictional Quarterly report - Google Chrome (Inkognito) window could retain its title and interaction metadata.

This change recognizes explicit private-window markers at capture and ingest, independently of older saved exclusion lists. Read-time guards also hide retained private-window records in local evidence, derived context, AI responses (including Full), hosted projections and exports. Structural event/session IDs, timestamps and durations remain available. Ordinary work titles and resource references retain their context.

No startup migration or historical database rewrite is introduced. Historical rows and existing screenshot files are not deleted; the existing activity-deletion controls remain available for removing stored history.

Validation:

• 27 privacy tests passed on this standalone branch, covering focus/click/copy/paste metadata, retained hosted projections, derived-context aliases, direct Activity rendering and normal-work false positives.
• Combined follow-up suite: 1,884 passed, 1 skipped; 31 focused privacy/Activity/export/paging checks passed after the final display adjustment.
• Fictional fixtures only; no user work records or titles are included in this PR.

The companion handoff PR, #262, is stacked on this branch. Neither PR should be merged automatically.