feat: unify mosaic CLI — single binary, no PATH conflict

- Rename framework bash launcher: mosaic → mosaic-launch
- npm CLI (@mosaic/cli) is now the single 'mosaic' binary on PATH
- Add launcher delegation: mosaic {claude,codex,opencode,pi,yolo}
  delegates to mosaic-launch via execFileSync with inherited stdio
- Add delegated management commands: init, doctor, sync, seq,
  bootstrap, coord, upgrade
- install.sh: remove framework bin PATH requirement, clean up old
  mosaic binary on upgrade, simplified summary output
- framework install.sh: preserve sources/ dir (fixes rsync noise
  about agent-skills)
- session-run.sh: update references to mosaic-launch

Users now only need ~/.npm-global/bin on PATH. The npm CLI finds
mosaic-launch at its absolute path (~/.config/mosaic/bin/mosaic-launch).

packages/mosaic/framework/bin/mosaic-launch

@@ -1,25 +1,21 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# mosaic — Unified agent launcher and management CLI
+# mosaic-launch — Framework agent launcher (called by the mosaic npm CLI)
 #
 # AGENTS.md is the global policy source for all agent sessions.
 # The launcher injects a composed runtime contract (AGENTS + runtime reference).
 #
-# Usage:
+# Usage (via mosaic CLI):
 #   mosaic claude [args...]       Launch Claude Code with runtime contract injected
-#   mosaic opencode [args...]     Launch OpenCode with runtime contract injected
 #   mosaic codex [args...]        Launch Codex with runtime contract injected
+#   mosaic opencode [args...]     Launch OpenCode with runtime contract injected
+#   mosaic pi [args...]           Launch Pi with runtime contract injected
 #   mosaic yolo <runtime> [args...]  Launch runtime in dangerous-permissions mode
-#   mosaic --yolo <runtime> [args...]  Alias for yolo
-#   mosaic init [args...]         Generate SOUL.md interactively
-#   mosaic doctor [args...]       Health audit
-#   mosaic sync [args...]         Sync skills
-#   mosaic seq [subcommand]       sequential-thinking MCP management (check/fix/start)
-#   mosaic bootstrap <path>       Bootstrap a repo
-#   mosaic upgrade release         Upgrade installed Mosaic release
-#   mosaic upgrade check           Check release upgrade status (no changes)
-#   mosaic upgrade project [args]  Upgrade project-local stale files
+#
+# Direct usage:
+#   mosaic-launch claude [args...]
+#   mosaic-launch yolo claude [args...]
 
 MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
 VERSION="0.1.0"