fix: keep fish clean-mode hooks after the crash fix

The crash fix moved shell-arg synthesis into the wrapper, but that accidentally dropped Taskers fish hooks for clean-profile launches. Clean mode should suppress user config, not Taskers integration. This follow-up keeps the fish hooks sourced in clean mode and adds coverage so fish/zsh profile env plus wrapper synthesis stay aligned.

Constraint: The wrapper must preserve Taskers shell integration even when shell-specific argv no longer flows through Ghostty
Rejected: Leave clean fish on --no-config only | it breaks Taskers lifecycle and metadata hooks for fish sessions
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Clean profile means no user config, not no Taskers integration; keep fish/zsh profile-sensitive wrapper behavior covered by tests
Tested: cargo test -p taskers-runtime --lib shell_wrapper
Tested: cargo test -p taskers-runtime --lib fish_and_zsh_launch_specs_preserve_shell_profile_env
Tested: cargo test -p taskers-ghostty --lib host_options
Tested: cargo test -p taskers runtime_bootstrap_tests --bin taskers-gtk
Tested: cargo install --path crates/taskers-app --force
Not-tested: Manual fish clean-profile launch from the desktop path

Author: OneNoted

crates/taskers-runtime/assets/shell/taskers-shell-wrapper.sh

@@ -62,7 +62,7 @@ if [ "$#" -eq 0 ]; then
       ;;
     fish)
       if [ "$SHELL_PROFILE" = "clean" ]; then
-        set -- --no-config --interactive
+        set -- --no-config --interactive --init-command "source \"$TASKERS_SHELL_INTEGRATION_DIR/taskers-hooks.fish\""
       else
         set -- --interactive --init-command "source \"$TASKERS_SHELL_INTEGRATION_DIR/taskers-hooks.fish\""
       fi

crates/taskers-runtime/src/shell.rs

@@ -779,6 +779,10 @@ mod tests {
             wrapper.contains("set -- -d -i"),
             "expected wrapper to synthesize zsh default launch flags when no explicit args are passed"
         );
+        assert!(
+            wrapper.contains("set -- --no-config --interactive --init-command"),
+            "expected clean-profile fish launches to keep sourcing taskers-hooks.fish"
+        );
     }
 
     #[test]