Adds the desktop-leaning batch needed to round the family to 90:
- add_user_card_v0 — compact avatar+name+role row
- add_drawer_shell_v0 — full-height side panel header
- add_combobox_v0 — open-state autocomplete with dropdown
- add_toolbar_v0 — desktop icon button row + dividers
- add_callout_v0 — inline doc tip block, 5 tones
- add_share_row_v0 — circular social-share buttons
- add_inline_action_v0 — message + Undo-style action
- add_legend_item_v0 — chart legend marker+label+value
- add_inbox_message_v0 — email/inbox row with unread dot
- add_profile_header_v0 — large profile hero block
All ten go through the standard 9-touchpoint wiring and land in a
new ext-4 schema shard so existing shards stay under 800 lines.
Drift guards (contract / registry parity / shim-server parity) cover
each new name; per-tool handler tests are deferred — every tool's
structure is exercised through the parity build call already.
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