docs: purge stale fabb3421 narrative — Mail.Send already lives in the 365 app suite

Mail.Send is NOT an open decision or a 'blocked' item: the Exchange Operator
tier (b43e7342) already holds Graph Mail.Send + Mail.ReadWrite +
MailboxSettings.ReadWrite (the suite's IR victim-notification mail path).
/mailbox (ACG own-mail) separately uses the dedicated ComputerGuru Mailbox app
1873b1b0. The deleted fabb3421/Claude-MSP-Access app is now referenced only as
DELETED/do-not-use across all live surfaces.

Corrected: remediation-tool gotchas.md (removed 'suite has no mail scopes /
mailbox BLOCKED / decision-not-executed'), commands/mailbox.md (header +
Attribution no longer name the deleted app as active), feedback memory
(promoted 'suite has Mail.Send — settled' to a headline), breach-report
template, .grok mirrors, credentials.md, CATALOG_SHARED_DATA.md, and wiki
(internal-infrastructure, glaztech, dataforth). Removed dead plaintext secret
for the deleted app from CATALOG_SHARED_DATA.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

wiki/clients/dataforth.md

@@ -323,7 +323,7 @@ Syncro asset IDs: 23845, 149614, 9708445, 9357407, 9276901, 9212922, 9078651, 88
 - **M365 admin:** sysadmin@dataforth.com — vault: `clients/dataforth/m365.sops.yaml`
 - **Tenant ID:** `7dfa3ce8-c496-4b51-ab8d-bd3dcd78b584`
 - **Claude-Code-M365 Entra App:** App ID `7a8c0b2e-57fb-4d79-9b5a-4b88d21b1f29`, secret expires 2027-12-22 — vault: `clients/dataforth/m365.sops.yaml → credentials.entra-app`
-- **MSP Multi-Tenant App (Claude-MSP-Access):** MSP tenant `ce61461e-81a0-4c84-bb4a-7b354a9a356d`, App ID `fabb3421-8b34-484b-bc17-e46de9703418` — vault: msp-tools SOPS file
+- **MSP remediation app suite:** MSP tenant `ce61461e-81a0-4c84-bb4a-7b354a9a356d` — tiered ComputerGuru apps (Exchange Operator `b43e7342` etc.), vault `msp-tools/computerguru-*.sops.yaml`. *(Old single app `fabb3421`/Claude-MSP-Access DELETED 2026-06-14 — AADSTS700016, do not use.)*
 - **ComputerGuru tiered apps:** All 5 apps consented 2026-04-23. Exchange Operator SP (b43e7342) had Exchange Admin role added manually (gap in onboard-tenant.sh — not auto-assigned for Exch Operator).
 
 ### MSP360 Managed Backup API