Give the ad slot's length one home

Four packages each wrote 15 seconds for the length of an advertising slot -- skips, transcript
twice, and signature -- and every copy carried a comment saying it agreed with the others: "the
same unit skips.Classify uses", "the same figure the length-gap rule uses", "one ad unit from the
start". The agreement was real and deliberate, and recorded only in prose, so a corpus that
revised the figure would have moved one copy and left three disagreeing silently.

internal/advertising holds it once. Each site keeps its own name and its own explanation of what
the unit means there, because those genuinely differ; only the number is shared.

The consolidation on its own fixes the four copies that existed. The audit test refuses the
fifth: it walks the server's production source and fails on the number written as a literal,
in either of Go's spellings. Watched failing on both before being trusted. Same arrangement as
safefetch/audit_test.go, and for the same reason -- the instance that was noticed was never the
whole of it.

No behaviour change: 366 server tests pass, same as before.

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

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