Final-pass polish: support contact UX, audit tooltip, doc refresh

Support teams: contact management moved from a row expander to a modal
(Contacts (N) button per team); application detail Support card and the
modal show Email (mailto) and Teams chat buttons for contacts with an
SSO, derived as sso@ + a new contact_email_domain site setting
(default geaerospace.com, blank hides the buttons).

Audit log: hovering a user SSO shows the full name, resolved
best-effort from the employee directory in either mode.

Docs/hygiene from a standards review: CLAUDE.md active-state,
CONTRACT-STABILITY.md and README brought to contract 0.10.0 / 11
plugins / migration head 7d22; get_asset_panels endpoint path fixed in
the hook docstring; leftover debug console.logs removed.

781 tests pass; contacts modal, action-button hrefs, and the audit
tooltip verified live.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

@@ -16,7 +16,7 @@ ShopDB tracks and manages:
 **Backend:**
 - Python 3.x with Flask
 - SQLAlchemy ORM
-- MySQL 5.6+ database
+- MySQL 5.7+ database (5.6 works with extra utf8mb4 config; see docs/DEPLOY.md)
 - JWT authentication
 - Plugin architecture for extensibility
 
@@ -204,11 +204,12 @@ Query parameters for list endpoints:
 
 ShopDB supports plugins for extending functionality. See `CONTRIBUTING.md` for plugin development guidelines.
 
-The image bundles ten plugins; only the ones a site installs are loaded:
+The image bundles eleven plugins; only the ones a site installs are loaded:
 
 - **computers** - Shopfloor PCs and workstations
 - **employees** - Employee directory
-- **machine** - CNC, CMM, and other shop-floor machines
+- **machines** - CNC, CMM, and other shop-floor machines
+- **measuringtools** - Gage-lab instruments with calibration tracking
 - **knowledgebase** - Documentation and troubleshooting guides
 - **network** - Network devices
 - **notifications** - Shopfloor notifications and recognition feed