[trissim]

Summary

P993 paired consumer for OpenHCSDev/agent-comms#3659: 1 production file, +2/-2. One per-message evidence lookup becomes one paired iteration for the whole page. No new cache, index, wrapper, fragment type, or compatibility path.

Landing sequence: Core #3659 first. After its merge, this same PR will run uv lock --upgrade-package agent-comms, commit the refreshed lock, and land through the merge queue. This initial source checkpoint deliberately does not pretend the old lock contains the new API.

Before / after

WireSource.read previously built each fragment from page.messages and independently asked page.evidence_for(message) for its original evidence page. Core rescanned the source pages for each such question.

It now iterates for message, evidence in page.message_evidence() and passes that evidence directly to the existing WireFragment.of. Message order, original evidence-page identity, viewer, style, fragment dispatch, measured page preparation, and page-edge construction are unchanged.

Core's MessagePage owns the association. Toad consumes it instead of reissuing the lookup per message. No source ownership moved into a UI field.

Source coverage and integration

Existing NRA source parser/index inventoried Core and Toad production roots: 917 modules, 13 related, no parser failures. Declarations, inheritance, imports, writes, decisions, and named consumers are retained in /home/ts/.cache/agent-scratch/producer-digest/p993-source-before.json; dynamic bindings and runtime mutation are outside that inventory's proof.

The older Toad queue carrier #1319 modifies this same constructor line by passing an additional page=page argument. That independent argument must be retained when the carrier reaches main; the batched evidence iteration must also remain. This PR does not take over the carrier's fragment/notification ownership.

Verification still owed

No author pytest, full suite, local ratchet, profile, install, or provider run. Combined execution belongs to the integration owner. Required path: Core tests/test_historical_views.py plus Toad tests/textual/test_wire_source.py; then actual Toad attached-archive channel opening and backward scrolling, confirming message order, original read evidence, and has-newer edges. Published source is not installed acceptance.

Assumed:

• Core #3659 merges before this PR's lock refresh and queue entry.
• Core's paired iteration preserves source-page identity and message order; Toad passes those objects through unchanged.
• Root owns combined controls and the real Toad acceptance run, as the order forbids author execution.

one page already knows where its messages came from
ask it once, not once per message

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