feat(fleet): system-type profiles — declarative roster+topology mapping (H2)

Add declarative system-type profiles: framework/fleet/profiles/*.yaml map a
system type to a persona roster + org topology (reports_to, multiplicity).
Profiles are DATA, seeded like roles, so an operator declares a system type and
gets the matching roster from the baseline library with no code change
(NS-9 / AC-NS-6).

- 5 baseline profiles: software-delivery, personal-assistant, research,
  business (company-in-a-box), marketing.
- fleet-profiles.ts: loadProfiles/loadProfile/parseProfile/validateProfile +
  listPersonaClasses (extracts valid classes from the role library by unioning
  inline `class:` markers, LIBRARY.md rows, and role filenames so marker-less
  personas like planner/decomposition resolve).
- CLI: `mosaic fleet profile list|show [--json]`; invalid profiles exit non-zero.
- Spec covers parse/validate, the library-drift guard (every referenced class
  resolves against the real role library), and unknown-class/reports_to rejection.
- install.sh: profiles seed via the existing rsync (comment clarified; the
  preserved top-level `fleet/*.yaml` glob does not shadow fleet/profiles/*.yaml).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/mosaic/framework/install.sh

@@ -24,9 +24,11 @@ INSTALL_MODE="${MOSAIC_INSTALL_MODE:-prompt}"
 # reconcile_framework_files (overwrite + backup-once); the rest stay user-owned.
 # User-created content in these paths survives rsync --delete.
 #
-# fleet/* — the framework SEEDS only fleet/examples, fleet/roles, and
+# fleet/* — the framework SEEDS fleet/examples, fleet/roles, fleet/profiles, and
 # fleet/roster.schema.json (synced normally — every fleet/roles/*.md role contract
-# lands automatically via this sync, so no per-file entry is needed). The user's
+# and fleet/profiles/*.yaml system-type profile lands automatically via this sync,
+# so no per-file entry is needed; the preserved "fleet/*.yaml" glob is anchored to
+# the top level only and does NOT shadow fleet/profiles/*.yaml). The user's
 # own fleet files MUST
 # survive `mosaic update` (which runs this sync automatically): the active
 # roster (`fleet/roster.yaml` + any other `fleet/*.yaml`), per-agent env