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>

docs/CONFIG.md

@@ -143,6 +143,7 @@ read back through the API.
 | `pc_access_domain` | `device.geaerospace.net` | Domain appended to a PC hostname for remote-access links. Blank = hostname as-is. |
 | `employeeid_pattern` | `^\d{9}$` | Regex a search term must match to be treated as an employee id. Invalid regex falls back to the default and never 500s. |
 | `printer_hostname_template` | `Printer-{ip}.printer.geaerospace.net` | Printer hostname template. `{ip}` is the dash-separated IP address. |
+| `contact_email_domain` | `geaerospace.com` | Email domain appended to a support contact's SSO to build email (`sso@domain`) and Teams-chat links. Blank hides the contact action buttons. |
 | `dualpath_single_machine` | `true` | Treat a Dualpath pair (a dual-bay machine with one controller) as a single machine in the machines list, dashboard/report counts, and the floor map (the secondary bay is hidden). The data model always keeps both bay records; detail pages stay per-bay with a sibling banner. `false` lists and counts both bays separately. |
 
 ### branding