giles f819fda587 aser_slot migration: single-pass expansion, pipe desync fix, _render_to_sx ...

Three fixes completing the aser_slot migration:

1. Single-pass full-page rendering: eval_sx_url builds layout+content
   AST and aser_slots it in ONE call — avoids double-aser where
   re-parsed content hits "Undefined symbol: title/deref" errors.

2. Pipe desync fix: _inject_helpers_locked runs INSIDE the aser_slot
   lock acquisition (not as a separate lock). Prevents interleaved
   commands from other coroutines between injection and aser-slot.

3. _render_to_sx uses aser_slot (not aser): layout wrappers like
   oob_page_sx contain re-parsed content from earlier aser_slot
   calls. Regular aser fails on symbols that were bound during
   the earlier expansion. aser_slot handles them correctly.

HTMX path: aser_slot the content, then oob_page_sx wraps it.
Full page path: build (~shared:layout/app-body :content wrapped_ast),
aser_slot in one pass, pass directly to sx_page.

New Playwright tests: test_navigate_geography_to_reactive,
test_direct_load_reactive_page.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-19 14:56:55 +00:00

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