fix(publisher): render current entry body in any content outlet

[DavidBabinec]

What changed

A base.outlet only rendered the current entry's body when the node carried a persisted dynamicBindings.html overlay — which was set in exactly one place: the auto-seeded default entry template (buildDefaultTemplateCells).

When a site owner builds their own post template and drags a Content Outlet in by hand, that outlet has props.html: '' and no binding, so the publisher filled it with nothing and it rendered as an empty <main data-instatic-content-region></main>.

The body resolution (resolveDynamicProps) is shared by all three render surfaces, so the gap broke the published page, the content preview API, and the Live Canvas editor alike.

Why

An outlet is, by definition, the hole the current entry's body flows into — there is no UI to bind it and the binding is always the same (currentEntry.body, rendered markdown → HTML). Relying on a persisted overlay that only the seeder set was fragile: any hand-authored outlet was silently broken.

The fix

• dynamicBindings.ts — new effectiveNodeBindings(node) helper applies the currentEntry.body → html binding implicitly to every base.outlet, merged on top of any persisted overlay.
• renderNode.ts (publisher) and NodeRenderer.tsx (editor canvas) now resolve through effectiveNodeBindings(node) so all surfaces behave identically.
• templateSeeding.ts — dropped the now-redundant persisted binding from the seed; a seeded outlet is now identical to a hand-dropped one (single source of truth).

Outside an entry route the entry stack is empty, so the binding resolves to nothing and the outlet stays empty — an everywhere layout's outlet still hosts a whole page.

User / developer impact

Dragging a Content Outlet into a custom post template now renders each post's body in it — on the canvas, in the live editor, and on the published page. No migration needed; existing seeded templates keep working (the implicit binding resolves to the same value).

Verification

• New src/__tests__/publisher/outletEntryBody.test.ts reproduces the bug (outlet with no persisted binding) and confirms the body renders, plus the inert-outside-entry-routes case.
• bun test src/__tests__/publisher/ src/core/templates/ server/publish/ → 405 pass.
• bun run build and bun run lint → clean.
• react-doctor --scope changed --base main → no new issues.

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