refactor(output): downgrade 'no worktree' message to info (#887)

When removing a branch that has no associated worktree, the message
'No worktree found for branch X' was shown as a warning (▲). This is
now an info message (○) since the branch exists and removal proceeds
normally.

The BranchOnly code path is only reached when the branch exists locally
(checked at repository_ext.rs:116), so this isn't a 'something doesn't
exist' warning scenario — it's purely informational.

Co-authored-by: Claude <noreply@anthropic.com>

Author: max-sixty

src/output/handlers.rs

@@ -545,10 +545,10 @@ fn handle_branch_only_output(
             ))
         );
     } else {
-        // No worktree at all - warn since user asked to remove something that doesn't exist
+        // No worktree at all, but branch exists - informational since branch removal will proceed
         eprintln!(
             "{}",
-            warning_message(cformat!(
+            info_message(cformat!(
                 "No worktree found for branch <bold>{branch_name}</>"
             ))
         );

tests/snapshots/integration__integration_tests__remove__remove_branch_matching_tree_content.snap

@@ -25,6 +25,7 @@ info:
     TERM: alacritty
     USERPROFILE: "[TEST_HOME]"
     WORKTRUNK_CONFIG_PATH: "[TEST_CONFIG]"
+    WORKTRUNK_TEST_CLAUDE_INSTALLED: "0"
     WORKTRUNK_TEST_SKIP_URL_HEALTH_CHECK: "1"
     WT_TEST_DELAYED_STREAM_MS: "-1"
     WT_TEST_EPOCH: "1735776000"
@@ -35,5 +36,5 @@ exit_code: 0
 ----- stdout -----
 
 ----- stderr -----
-[33m▲[39m [33mNo worktree found for branch [1mfeature-squashed[22m[39m
+[2m○[22m No worktree found for branch [1mfeature-squashed[22m
 ✓ Removed branch feature-squashed (tree matches main, ⊂)

tests/snapshots/integration__integration_tests__remove__remove_branch_no_worktree_path_occupied.snap

@@ -25,6 +25,7 @@ info:
     TERM: alacritty
     USERPROFILE: "[TEST_HOME]"
     WORKTRUNK_CONFIG_PATH: "[TEST_CONFIG]"
+    WORKTRUNK_TEST_CLAUDE_INSTALLED: "0"
     WORKTRUNK_TEST_SKIP_URL_HEALTH_CHECK: "1"
     WT_TEST_DELAYED_STREAM_MS: "-1"
     WT_TEST_EPOCH: "1735776000"
@@ -35,5 +36,5 @@ exit_code: 0
 ----- stdout -----
 
 ----- stderr -----
-[33m▲[39m [33mNo worktree found for branch [1mnpm[22m[39m
+[2m○[22m No worktree found for branch [1mnpm[22m
 ✓ Removed branch npm (same commit as main, _)

tests/snapshots/integration__integration_tests__remove__remove_branch_only_force_delete.snap

@@ -26,6 +26,7 @@ info:
     TERM: alacritty
     USERPROFILE: "[TEST_HOME]"
     WORKTRUNK_CONFIG_PATH: "[TEST_CONFIG]"
+    WORKTRUNK_TEST_CLAUDE_INSTALLED: "0"
     WORKTRUNK_TEST_SKIP_URL_HEALTH_CHECK: "1"
     WT_TEST_DELAYED_STREAM_MS: "-1"
     WT_TEST_EPOCH: "1735776000"
@@ -36,5 +37,5 @@ exit_code: 0
 ----- stdout -----
 
 ----- stderr -----
-[33m▲[39m [33mNo worktree found for branch [1mfeature-force[22m[39m
+[2m○[22m No worktree found for branch [1mfeature-force[22m
 ✓ Removed branch feature-force (--force-delete)

tests/snapshots/integration__integration_tests__remove__remove_branch_only_merged.snap

@@ -25,6 +25,7 @@ info:
     TERM: alacritty
     USERPROFILE: "[TEST_HOME]"
     WORKTRUNK_CONFIG_PATH: "[TEST_CONFIG]"
+    WORKTRUNK_TEST_CLAUDE_INSTALLED: "0"
     WORKTRUNK_TEST_SKIP_URL_HEALTH_CHECK: "1"
     WT_TEST_DELAYED_STREAM_MS: "-1"
     WT_TEST_EPOCH: "1735776000"
@@ -35,5 +36,5 @@ exit_code: 0
 ----- stdout -----
 
 ----- stderr -----
-[33m▲[39m [33mNo worktree found for branch [1mfeature-merged[22m[39m
+[2m○[22m No worktree found for branch [1mfeature-merged[22m
 ✓ Removed branch feature-merged (same commit as main, _)

tests/snapshots/integration__integration_tests__remove__remove_branch_only_unmerged.snap

@@ -25,6 +25,7 @@ info:
     TERM: alacritty
     USERPROFILE: "[TEST_HOME]"
     WORKTRUNK_CONFIG_PATH: "[TEST_CONFIG]"
+    WORKTRUNK_TEST_CLAUDE_INSTALLED: "0"
     WORKTRUNK_TEST_SKIP_URL_HEALTH_CHECK: "1"
     WT_TEST_DELAYED_STREAM_MS: "-1"
     WT_TEST_EPOCH: "1735776000"
@@ -35,6 +36,6 @@ exit_code: 0
 ----- stdout -----
 
 ----- stderr -----
-[33m▲[39m [33mNo worktree found for branch [1mfeature-unmerged[22m[39m
+[2m○[22m No worktree found for branch [1mfeature-unmerged[22m
 ○ Branch feature-unmerged retained; has unmerged changes
 ↳ To delete the unmerged branch, run wt remove feature-unmerged -D

tests/snapshots/integration__integration_tests__remove__remove_detached_worktree_in_multi.snap

@@ -26,6 +26,7 @@ info:
     TERM: alacritty
     USERPROFILE: "[TEST_HOME]"
     WORKTRUNK_CONFIG_PATH: "[TEST_CONFIG]"
+    WORKTRUNK_TEST_CLAUDE_INSTALLED: "0"
     WORKTRUNK_TEST_SKIP_URL_HEALTH_CHECK: "1"
     WT_TEST_DELAYED_STREAM_MS: "-1"
     WT_TEST_EPOCH: "1735776000"
@@ -38,6 +39,6 @@ exit_code: 0
 ----- stderr -----
 ◎ Removing feature-a worktree in background
 ↳ Branch unmerged; to delete, run wt remove feature-a -D
-[33m▲[39m [33mNo worktree found for branch [1mfeature-b[22m[39m
+[2m○[22m No worktree found for branch [1mfeature-b[22m
 ○ Branch feature-b retained; has unmerged changes
 ↳ To delete the unmerged branch, run wt remove feature-b -D

tests/snapshots/integration__integration_tests__remove__remove_squash_merged_then_main_advanced.snap

@@ -25,6 +25,7 @@ info:
     TERM: alacritty
     USERPROFILE: "[TEST_HOME]"
     WORKTRUNK_CONFIG_PATH: "[TEST_CONFIG]"
+    WORKTRUNK_TEST_CLAUDE_INSTALLED: "0"
     WORKTRUNK_TEST_SKIP_URL_HEALTH_CHECK: "1"
     WT_TEST_DELAYED_STREAM_MS: "-1"
     WT_TEST_EPOCH: "1735776000"
@@ -35,5 +36,5 @@ exit_code: 0
 ----- stdout -----
 
 ----- stderr -----
-[33m▲[39m [33mNo worktree found for branch [1mfeature-squash[22m[39m
+[2m○[22m No worktree found for branch [1mfeature-squash[22m
 ✓ Removed branch feature-squash (all changes in main, ⊂)