Close the reachability guard's blind spot

It matched `fun` at four spaces, so every `internal fun` on a helper object was
invisible to it -- which is most of what this app's UI layer exposes to its own
module. The guard that exists because findFeedLink and QueueRepository.advance
were written, tested, documented and never called could not see that whole
category.

It also credited only cross-file callers, so a helper called by its own object's
public entry point looked dead and needed an allowlist entry explaining that it
was not. Same-file callers now count, with declarations stripped first so a
function cannot find itself -- the trick the DAO half of this test already used.

Both together: a wider net and one fewer exception. The allowlist is down to a
single entry.

Watched failing on a deliberately dead `internal fun` before being kept, and
watched passing with the entry removed -- so the widening caught nothing that
was actually live.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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