chore: remove unused inject_into_sse_body and scrub_sse_body wrappers

[detail-app]

Removes two pub thin-wrapper functions in dwctl/src/prompt_cache/inject.rs
that had no production callers anywhere in the workspace:

• inject_into_sse_body: wrapped scan_edit_sse(_, UsageEdit::Inject(stats)).rewritten
• scrub_sse_body: wrapped scan_edit_sse(_, UsageEdit::Scrub).rewritten

The production streaming path (prompt_cache/layer.rs) calls scan_edit_sse
directly with the appropriate UsageEdit variant, bypassing both wrappers — as
inject_into_sse_body's own doc comment already noted. Neither was re-exported
from prompt_cache/mod.rs, dwctl is publish = false and no other workspace
crate depends on it, so there is no external-consumer risk. Git history confirms
neither wrapper ever had a production caller.

Test call sites that referenced the wrappers are retargeted to call
scan_edit_sse directly with the equivalent UsageEdit variant, preserving
every test scenario (CRLF framing, data:/data: prefixes, terminal-frame-only
edits, scrub zeroing, no-op-when-clean).

History

• Last materially changed July 2026 (fix: scrub provider-written cache fields from inactive cache-layer re… #1411 @hachall)

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