recall dump: <mosaico> and <tenex-edge> harness blocks not stripped

What's wrong

The 2026-07-21 recall corpus (pc recall dump) still contains raw <mosaico>...</mosaico> and <tenex-edge>...</tenex-edge> harness blocks inside user-role messages, e.g.:

<mosaico>
  <channel ref="f7z.io">
    <message from="@Pablo" id="c7487f">@slate...

<tenex-edge>
  <channel ref="aaa.tenex-edge">
    <message from="@laptop (tenex-edge)" id="...">mgmt error: unsupported...

These are harness/relay artifacts, not user-authored text, and should be filtered like the other wrapper types.

Root cause (confirmed in code)

In src/recall/extract.rs:

• WRAPPER_PREFIXES (line 14) — the list used to detect and drop whole wrapper-only messages — has no entry for <mosaico or <tenex-edge.
• inline_removers() (line 76-86) — the list used to strip embedded wrapper blocks out of otherwise-human messages — only covers system-reminder, local-command-[a-z]+, bash-[a-z]+, command-[a-z]+, user-prompt-submit-hook, post-tool-use-hook, pre-tool-use-hook, function_results?, task-notification. mosaico and tenex-edge are absent from both lists.

Also missing: the "UserPromptSubmit hook success: ..." prefix format (as distinct from the <user-prompt-submit-hook> XML tag) doesn't match anything in either list.

Impact

A stratified 300-message sample of the frozen dump found <mosaico>/<tenex-edge> wrapper content in ~11% of user messages (concentrated on the laptop host, ~13.7% there vs 6-7% elsewhere), and roughly 15% of messages mix real human text with an unstripped wrapper block in the same message. Any consumer relying on --clean dump output to isolate human-authored utterances gets contaminated with relayed/mechanical content for these two tag families.

Fix

Add mosaico and tenex-edge to inline_removers()'s tag-name list (same lazy <X>...</X> removal pattern already used for the other tag families), and add <mosaico / <tenex-edge to WRAPPER_PREFIXES for the whole-message-is-only-a-wrapper case. Consider a prefix match for "UserPromptSubmit hook success:" and equivalent hook-success text forms as well.

Start in src/recall/extract.rs by reading WRAPPER_PREFIXES and inline_removers(). Update the wrapper handling for mosaico, tenex-edge, and the UserPromptSubmit hook success prefix, then verify that whole-wrapper messages are dropped and embedded blocks are removed from mixed user messages.