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>

.grok/skills/mailbox/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: mailbox
 description: >
-  Read and send mail for an Arizona Computer Guru mailbox via Microsoft Graph (shared Claude-MSP-Access app). Defaults to the mailbox of the running user (from identity.json). Use for "/mailbox", "check my email", "send a message as <user>@azcomputerguru.com".
+  Read and send mail for an Arizona Computer Guru mailbox via Microsoft Graph (dedicated ComputerGuru Mailbox app 1873b1b0; NOT the deleted fabb3421/Claude-MSP-Access). Defaults to the mailbox of the running user (from identity.json). Use for "/mailbox", "check my email", "send a message as <user>@azcomputerguru.com".
 ---
 
 See `.claude/commands/mailbox.md` and the remediation-tool skill (they share Graph access patterns). Use vault/1p for the app credentials. Gated for writes.

.grok/skills/remediation-tool/SKILL.md

@@ -12,7 +12,7 @@ description: >
 - Read-only by default.
 - All write/remediation actions are **gated** behind explicit `--confirm` or user approval.
 - Use the skill's structured flows for tenant sweeps, password spray detection, inbox rule enumeration, mailbox searches, etc.
-- NOT for CIPP — this is the direct Graph API app suite (Claude-MSP-Access or equivalent).
+- NOT for CIPP — this is the direct Graph API tiered app suite (Security Investigator / Exchange Operator / User Manager / Tenant Admin / Defender). The old single `fabb3421`/Claude-MSP-Access app was DELETED 2026-06-14 — do not reference it. Mail.Send lives in the Exchange Operator tier (b43e7342).
 
 When invoked:
 - Read the command doc `.claude/commands/remediation-tool.md`.