fix(packaging/windows): make the .iss pure ASCII (ISCC encoding failure)

The smoke-test diagnostic proved Inno itself is healthy (a trivial ASCII script
compiled), while the real .iss died before the "Compiler engine version" line —
i.e. at script open, not during compile. The difference: the real .iss was UTF-8
with non-ASCII chars (→, —) in comments, which ISCC 6.4+ rejects without a UTF-8
BOM (and the German-locale runner misreads). Replace them with ASCII (->, -).

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

packaging/windows/punktfunk-host.iss

@@ -3,8 +3,8 @@
 ; Produces a signed setup.exe that lays the host into Program Files, optionally installs the bundled
 ; SudoVDA virtual-display driver, and DELEGATES service registration to `punktfunk-host service
 ; install`. The real, idempotent install logic (SCM registration, firewall rules, default host.env,
-; the SYSTEM→interactive-session CreateProcessAsUserW supervisor for secure-desktop capture) lives in
+; the SYSTEM->interactive-session CreateProcessAsUserW supervisor for secure-desktop capture) lives in
-; crates/punktfunk-host/src/service.rs — this script does NOT duplicate it. That SYSTEM service model
+; crates/punktfunk-host/src/service.rs - this script does NOT duplicate it. That SYSTEM service model
 ; is exactly why MSIX is unusable here and we ship a classic elevated installer instead.
 ;
 ; Built by pack-host-installer.ps1, e.g.:
@@ -80,7 +80,7 @@ Filename: "powershell.exe"; \
   StatusMsg: "Installing the SudoVDA virtual display driver..."; \
   Flags: runhidden waituntilterminated; Tasks: installdriver
 #endif
-; Register (or re-point, on upgrade — idempotent) the SYSTEM service from its FINAL {app} location:
+; Register (or re-point, on upgrade - idempotent) the SYSTEM service from its FINAL {app} location:
 ; service install records current_exe() as the SCM binPath, so it must run from {app}, not {tmp}.
 Filename: "{app}\punktfunk-host.exe"; Parameters: "service install"; WorkingDir: "{app}"; \
   StatusMsg: "Registering the punktfunk host service..."; Flags: runhidden waituntilterminated