Closes R13 (F3-m3). mosaic update installed the new npm CLI but never re-seeded ~/.config/mosaic from the package's bundled framework/, so shipped launcher/runtime changes (agent-name export + native HB) stayed DORMANT until a manual re-seed — operators got the new CLI on a stale framework. - update-checker.ts: resolveBundledFrameworkRoot, buildReseedCommand (install.sh in MOSAIC_SYNC_ONLY=1 MOSAIC_INSTALL_MODE=keep — the P4 data-safe reconcile: framework-owned overwrite + backup-once; SOUL/USER/*.local/credentials kept), runFrameworkReseed, readRosterAgentNames, buildRelaunchCommands. - cli.ts update: after a successful CLI install that includes @mosaicstack/mosaic, re-seed the framework (default-on; --no-reseed to skip). Then --relaunch restarts rostered agents (systemctl --user restart mosaic-agent@<name>), else prints clear activation guidance. Only re-seeds when the framework-bearing package updated. Flow: update CLI -> re-seed framework (data-safe) -> relaunch agents (opt-in). Verified: 6 new unit tests + 19 runtime + 26 launch tests green; tsc/eslint/ prettier clean. Sync data-safety already proven (P4 matrix + live validation). Refs #609 Co-Authored-By: Claude Opus 4.8 <[email protected]> Claude-Session: https://claude.ai/code/session_01EsgTQzV5YUGk1JtCLP4B83