[chubes4]

Summary

Shared-chrome projections previously inherited only the last contributing instance’s media. They now retain one instance per distinct media/type pair, positioned after its last applicable contributor.

What changed

• Group projection placements by media/type without duplicating identical-condition contributors.
• Preserve single-instance behavior, fallback placement, and unique document orders.
• Verify downstream enqueues preserve separate instances with distinct handles; no downstream change was needed.
• Add and register the two-page regression and single-link control. On trunk it failed: “Shared-chrome .pill rules retain an unconditional instance on index.html.” It passes with the fix.
• Leave shared-chrome-stylesheet-scope.php and all existing expectations unchanged.
• Additive: restores missing media coverage while preserving same-condition coalescing and existing fallback behavior.

Verification

• passed on f9d9295. Base trunk@0c584a8 unchanged.

set -e
cd php-transformer
(test -d vendor || composer install --no-progress --no-interaction)
( while sleep 60; do echo "gate heartbeat: composer test still running"; done ) &
hb=$!
trap 'kill $hb 2>/dev/null || true' EXIT
composer test

• CI: pending

Cook run

• Gate 1: tree 73c3ef0d8f6c541c4938442920b673b9e74b7751, fingerprint 7ac8fdd66fc1208672ca4b9e45ccaeb6c1a586394af234ca3c11dd3767889bb2
• Publication identity: ambient_gh

AI assistance

Tool: Homeboy (pi) · Model: gpt-6.1-sol (tier roadie/cook-heavy) · Used for: AI inspected the issue and enqueue pipeline, implemented the fix and regression test, and verified the full test suite.

Closes #3571

[chubes4]

Reviewed and verified on a real import.

• Diff: per document, the projection gets one instance per distinct (media, type) of its contributing instances, after the last link with that condition. tests/contract/shared-chrome-stylesheet-scope.php is unchanged and passes.
• Two-page repro from Shared-chrome stylesheet projection keeps only the last source instance's media #3571 (SSI dev package on 5d02f53061): the shared .pill background is present at 1440px and 600px. On v0.44.198 it was transparent at 1440px.
• Ringwave home + about-us slice (DLA desktop+mobile capture documents): the desktop Wix menu now renders as the source does. Pill at 634×41 (403,17), display:flex, dropdowns closed, and the hero H1 is visible (it hit-tests as itself). On v0.44.198 the same capture produced a display:block stack with every dropdown open, covering the H1.
• CI 15/15. One rerun was needed: the first PHP 8.3 integration job hit an HTTP 429 on a composer dist download.

AI disclosure: Claude (Opus) via Roadie/Pi reviewed and verified this under Chris Huber's direction; the fix was written by a Homeboy cook (gpt-6.1-sol).