[chubes4]

Fixes #5212.

Problem

Engine-support CSS was written per route, so a rule needed on N routes was copied into N stylesheets. Each copy also got its own ~600-byte enqueue condition that resolved the current document inline.

Change

• Allocate by exact owner set. allocateDocumentSupport() splits engine-support rules by the exact set of documents that consume them, keeping before-author and after-author support separate. A rule set consumed by every canonical page becomes global, as trunk's dedup path already did. Subsets keep exact owner scopes, so the Page-owned engine-support stylesheets are enqueued unconditionally on every route #4007/Preserve document scopes when deduplicating support stylesheets #4016 invariant holds and document-support-stylesheet-scope.php is unchanged. Sheets with url( references or at-rule statements keep their original resource.
• Resolve the document once. The wp_enqueue_scripts callback resolves the document id, reconciliation identity and page-uri fallback at the top. Each resource then gets one enqueue that tests membership in its owner list.
• No empty CSS resources. Editor-state occurrence ownership is now replay metadata on the real resource, and support or editor-state sheets left empty by dead-selector removal are dropped.

Evidence

Real site: the tarotkarima.carrd.co capture (10 routes), compiled by ArtifactCompiler, trunk vs fix:

	trunk	fix
support CSS bytes	62,522	16,121 (−74%)
total CSS bytes	241,592	195,191
support files	19	25 (one per distinct owner set)
global support files	4	6
empty CSS files	0	0
functions.php bytes	71,834	68,023

Most of what remains in functions.php is the editor presentation tables (~16.5 KB), which is out of scope here.

• New contract support-owner-set-allocation.php (with a realistic 6-page fixture): every rule is written once, all-pages rules are global, subset rules have exact owner scopes, no empty support or editor-state assets, and per-document cascade order holds. It fails on trunk (Each generated rule is written exactly once: all-copy).
• Lab hand gate on 00e622be30: composer test:canonical GATE=0.
• Test updates: condition-string expectations now point at the compact form. declaration-addressed-chrome.php now expects that editor-state sheets left empty after chrome extraction are not published.

AI disclosure: Implemented across three Homeboy Cooks (pi, gpt-6.1-sol). Franklin (Claude Code, Claude Opus) rejected the first design for regressing #4007, reviewed the revisions, gated on Lab, measured the real site, and wrote this PR.

[chubes4]

Pushed 479d6fa. CI parity caught a real ordering bug: all allocated support sheets were spliced in at the first eligible index, which put after-author support ahead of the author inline sheet in the asset inventory (artifact-author-selector-inline-projection). Each allocated sheet now takes the slot of the first sheet it draws rules from. Lab: test:canonical + test:parity (351 fixtures) pass. Tarot numbers unchanged (support 62,522 → 16,121 bytes).

AI disclosure: Franklin (Claude Code, Claude Opus) made this fix and gated it on Lab.