Session log: multi-user setup, audit + gap fixes, Howard onboarding package

Two session logs:
- session-logs/2026-04-16-session.md: cross-cutting (multi-user, audit, infrastructure)
- guru-rmm session log appended: MSI installer, Len's Auto Brokerage, Uranus, migration drift

Gap fixes: GrepAI initialized + MCP server added, Ollama models pulling,
settings.json created (bypassPermissions), MCP_SERVERS.md written.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/remediation-tool/references/graph-endpoints.md

@@ -0,0 +1,144 @@
+# Graph + Exchange REST Cheatsheet
+
+All examples assume `$GT` = Graph token, `$EXO` = Exchange token, `$TID` = tenant ID, `$UPN`/`$UID` = user identifiers.
+
+## Graph API (`https://graph.microsoft.com/v1.0`)
+
+### User lookup / status
+
+```bash
+# By UPN
+curl -s -H "Authorization: Bearer $GT" \
+  "https://graph.microsoft.com/v1.0/users/$UPN?\$select=id,displayName,userPrincipalName,mail,accountEnabled,createdDateTime,lastPasswordChangeDateTime"
+
+# All users (filter, paged)
+curl -s -H "Authorization: Bearer $GT" \
+  "https://graph.microsoft.com/v1.0/users?\$top=999&\$filter=accountEnabled%20eq%20true"
+```
+
+### Mailbox
+
+```bash
+# Visible inbox rules (Graph v1.0 — does NOT return hidden rules)
+/users/$UPN/mailFolders/inbox/messageRules
+
+# Mailbox settings (auto-reply, delegates meeting option, NOT forwarding flags)
+/users/$UPN/mailboxSettings
+
+# Recent sent / deleted
+/users/$UPN/mailFolders/sentitems/messages?$top=25&$orderby=sentDateTime%20desc
+/users/$UPN/mailFolders/deleteditems/messages?$top=25&$orderby=receivedDateTime%20desc
+```
+
+### Authentication methods
+
+```bash
+/users/$UPN/authentication/methods
+# Watch for new methods added within the attack window
+```
+
+### OAuth + app role assignments
+
+```bash
+/users/$UPN/oauth2PermissionGrants      # user-level consents
+/users/$UPN/appRoleAssignments          # apps assigned to this user
+/servicePrincipals/$SP_ID/appRoleAssignments  # what scopes a SP has
+```
+
+### Sign-ins (needs Entra ID P1 or higher)
+
+```bash
+# Interactive sign-ins v1.0 (does NOT include non-interactive/service-principal)
+/auditLogs/signIns?$filter=userId eq '$UID' and createdDateTime ge $FROM&$top=200
+
+# All sign-in event types (beta endpoint)
+/beta/auditLogs/signIns?$filter=userId eq '$UID' and (signInEventTypes/any(t:t eq 'nonInteractiveUser'))
+
+# Foreign successful sign-ins tenant-wide
+/auditLogs/signIns?$filter=(status/errorCode eq 0) and (location/countryOrRegion ne 'US')
+```
+
+### Directory audits
+
+```bash
+# Changes targeting a specific user
+/auditLogs/directoryAudits?$filter=targetResources/any(t:t/id eq '$UID')
+
+# Tenant-wide consent / auth-method / role events
+/auditLogs/directoryAudits?$filter=activityDateTime ge $FROM
+# Then client-side filter by activityDisplayName ~ Consent|Authentication Method|Add service principal|Add member to role
+```
+
+### Identity Protection (needs IdentityRiskyUser.Read.All)
+
+```bash
+/identityProtection/riskyUsers
+/identityProtection/riskyUsers/$UID
+/identityProtection/riskDetections?$filter=userId eq '$UID'
+```
+
+### B2B guests
+
+```bash
+# Get guest by gmail/external address
+/users?$filter=startswith(userPrincipalName,'dunedolly21')
+
+# Invite audits
+/auditLogs/directoryAudits?$filter=activityDisplayName eq 'Invite external user'
+```
+
+## Exchange Online REST (`https://outlook.office365.com/adminapi/beta/{tenant-id}/InvokeCommand`)
+
+POST with JSON body `{"CmdletInput":{"CmdletName":"<cmdlet>","Parameters":{...}}}`. Token scope: `https://outlook.office365.com/.default`.
+
+### Inbox rules (INCLUDING hidden)
+
+```json
+{"CmdletInput":{"CmdletName":"Get-InboxRule","Parameters":{"Mailbox":"user@domain.com","IncludeHidden":true}}}
+```
+
+Why this matters: attackers commonly create hidden rules that Graph v1.0 cannot see.
+
+### Mailbox forwarding / properties
+
+```json
+{"CmdletInput":{"CmdletName":"Get-Mailbox","Parameters":{"Identity":"user@domain.com"}}}
+```
+
+Check: `ForwardingAddress`, `ForwardingSmtpAddress`, `DeliverToMailboxAndForward`, `GrantSendOnBehalfTo`, `HiddenFromAddressListsEnabled`.
+
+### Mailbox permissions (delegates / FullAccess)
+
+```json
+{"CmdletInput":{"CmdletName":"Get-MailboxPermission","Parameters":{"Identity":"user@domain.com"}}}
+```
+
+Filter out `NT AUTHORITY\\SELF` — anything else is a delegate.
+
+### SendAs permissions
+
+```json
+{"CmdletInput":{"CmdletName":"Get-RecipientPermission","Parameters":{"Identity":"user@domain.com"}}}
+```
+
+### Transport rules (tenant-wide mail flow)
+
+```json
+{"CmdletInput":{"CmdletName":"Get-TransportRule","Parameters":{}}}
+```
+
+Check for rules that reroute, delete, or exfiltrate mail.
+
+### SMTP AUTH
+
+```json
+{"CmdletInput":{"CmdletName":"Get-CASMailbox","Parameters":{"Identity":"user@domain.com"}}}
+```
+
+Check `SmtpClientAuthenticationDisabled`. To disable SMTP AUTH on a single mailbox (remediation): `Set-CASMailbox -SmtpClientAuthenticationDisabled $true`.
+
+## Rate limits / pagination
+
+- Graph signIns endpoints cap `$top` at 999. For >999 results, follow `@odata.nextLink`.
+- Exchange REST has undocumented throttling — if you hit 429, back off 30–60s.
+- Token is valid ~60 minutes. Script caches for 55 min.