docs(multitenant): add agent identity table to handoff

Introduce distinct user.name per agent so git log attribution is
unambiguous. All three agents share the same Codeberg key but set
different user.name values in the repo.

---
Build: pass | Tests: pass — 1812 passed (115 files)

docs/internal/MULTITENANT-HANDOFF.md

@@ -1,5 +1,22 @@
 # Multitenant Handoff
 
+## Agent Identity
+
+| Agent             | `user.name`         | Platform | Lane                            |
+| ----------------- | ------------------- | -------- | ------------------------------- |
+| Operator & zAI    | `Operator & zAI`    | Linux    | Code review, cleanup, push      |
+| Operator & Codex  | `Operator & Codex`  | FreeBSD  | Tests, build, host provisioning |
+| Operator & Claude | `Operator & Claude` | Linux    | Code review, edits, push        |
+
+All agents share `user.email = hello@clawdie.si`.
+Check attribution: `git log --format='%h %an — %s' -20`
+
+Each agent must set `user.name` in the repo before committing:
+
+```
+git config user.name "Operator & <agent>"
+```
+
 ## In flight
 
 This branch is worked on by more than one agent in parallel. Before
@@ -7,7 +24,7 @@ starting a new edit, append a one-line claim here; remove the line in
 the same commit that closes the work. Keep entries short and concrete
 so a peer can tell at a glance whether their planned change overlaps.
 
-Format: `- <agent> · <files or surface> · <one-line intent> · <YYYY-MM-DDTHH:MMZ>`
+Format: `- <user.name> · <files or surface> · <one-line intent> · <YYYY-MM-DDTHH:MMZ>`
 
 Working agreement:
 
@@ -88,6 +105,7 @@ Cross-repo:
 886 lines now. Working through my own 16-point gap analysis:
 
 Bugs fixed:
+
 - `platform.reserved_host_labels` schema field + dedicated section
   enumerating `[ai, cms, git, web, www, mail]`. Decision 13's
   Configurable cell now reads "No — `ai` is reserved" instead of
@@ -109,6 +127,7 @@ Bugs fixed:
   `host_label`).
 
 Substantial gaps filled:
+
 - New "How tenants reach the code service" section parallel to CMS:
   operator-only admin in V2, tenants reach via git+SSH/HTTPS.
 - New `code_admin_exposure` schema field with V2: must be
@@ -122,6 +141,7 @@ Substantial gaps filled:
   `ai.<internal_base>`.
 
 Polish:
+
 - Stale claim example removed from the In flight format spec.
 - New "Naming conventions appendix" with mechanical rules.
 - Wildcard DNS/TLS sharp-edge note in the cloud worked example.