Add terminal E2E matrix runner

tools/TERMINAL_E2E.md

@@ -3,6 +3,15 @@
 `zig build terminal-e2e` runs `tools/terminal_e2e.py` against the compiled `mim`
 binary and writes ignored artifacts under `.zig-cache/terminal-e2e/<scenario>/`.
 
+Matrix input profiles:
+
+- `ios-default-qwertz-space-path` means the scenario may use only letters and
+  Space from the default iOS software keyboard. No Esc, Ctrl, Alt, function keys,
+  arrow keys, or symbol-layer punctuation should appear in that profile. Use
+  this for primary mobile workflows.
+- `attached-keyboard` is allowed to cover Esc, arrows, Home/End, punctuation, and
+  other physical-key aliases.
+
 Artifact roles:
 
 - `manifest.tsv`: stable scenario facts, hashes, bare-LF status, and artifact list.
@@ -21,6 +30,8 @@ Golden policy:
   see.
 - Updating artifacts is safe only after the change is intentional and the receipt
   names the changed UI/control-byte behavior.
+- Adding a mobile scenario must preserve the `ios-default-qwertz-space-path`
+  contract unless the issue explicitly targets attached keyboards.
 - Bare LF in raw-mode terminal output is a regression unless a scenario explicitly
   proves a non-raw stream. Raw-mode rendering should use CRLF to avoid diagonal
   terminal skew.