Fix #1096: print runtime errors in context of failing subproject

Replace the pattern of collecting RuntimeErrors across all subprojects
and printing them at the end with immediate in-context logging via
`logger.print_warning_line(project.name, str(exc))` at the point of
failure. This ensures errors like "svn not available on system" appear
next to the subproject they belong to instead of at the end of the run.

The final `raise RuntimeError()` (no message) still produces a non-zero
exit code without double-printing.

Also bumps version to 0.14.0 and updates CHANGELOG, feature tests.

https://claude.ai/code/session_01RTgPqrX37jFkK843dq65Bu

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

features/check-git-repo.feature

@@ -180,9 +180,10 @@ Feature: Checking dependencies from a git repository
         Then the output shows
             """
             Dfetch (0.14.0)
-            >>>git ls-remote --heads https://giiiiiidhub.com/i-do-not-exist/broken<<< failed!
-            'https://giiiiiidhub.com/i-do-not-exist/broken' is not a valid URL or unreachable:
-            fatal: unable to access 'https://giiiiiidhub.com/i-do-not-exist/broken/': Could not resolve host: giiiiiidhub.com
+              non-existent-url:
+              > >>>git ls-remote --heads https://giiiiiidhub.com/i-do-not-exist/broken<<< failed!
+                'https://giiiiiidhub.com/i-do-not-exist/broken' is not a valid URL or unreachable:
+                fatal: unable to access 'https://giiiiiidhub.com/i-do-not-exist/broken/': Could not resolve host: giiiiiidhub.com
             """
 
       Scenario: A non-existent tag, branch or revision is reported

features/check-svn-repo.feature

@@ -138,10 +138,11 @@ Feature: Checking dependencies from a svn repository
         Then the output shows
             """
             Dfetch (0.14.0)
-            >>>svn info --non-interactive https://giiiiiidhub.com/i-do-not-exist/broken/trunk<<< failed!
-            'https://giiiiiidhub.com/i-do-not-exist/broken/trunk' is not a valid URL or unreachable:
-            svn: E170013: Unable to connect to a repository at URL 'https://giiiiiidhub.com/i-do-not-exist/broken/trunk'
-            svn: E670002: Name or service not known
+              non-existent-url:
+              > >>>svn info --non-interactive https://giiiiiidhub.com/i-do-not-exist/broken/trunk<<< failed!
+                'https://giiiiiidhub.com/i-do-not-exist/broken/trunk' is not a valid URL or unreachable:
+                svn: E170013: Unable to connect to a repository at URL 'https://giiiiiidhub.com/i-do-not-exist/broken/trunk'
+                svn: E670002: Name or service not known
             """
 
     Scenario: A non-existent tag in svn repo

features/patch-after-fetch-svn.feature

@@ -76,5 +76,5 @@ Feature: Patch after fetching from svn repo
                 source/target file does not exist:
                   --- b'build-deb2.sh'
                   +++ b'build-deb2.sh'
-            Applying patch "diff.patch" failed
+              > Applying patch "diff.patch" failed
             """