Export SQLite auto-extension symbols for PHP.wasm side modules

[adamziel]

What it does

Exports SQLite's sqlite3_auto_extension() and
sqlite3_cancel_auto_extension() symbols from PHP.wasm main modules.

Rationale

External PHP.wasm side modules can register SQLite virtual table modules by
calling sqlite3_auto_extension() during PHP startup. The markdown editor now
lives in adamziel/wp-extensions and uses this path to register its
markdown_posts and markdown_postmeta virtual tables.

The current published @wp-playground/cli@3.1.30 cannot run that extension:
it does not expose the complete --php-extension workflow, and its PHP.wasm
builds do not export these SQLite symbols. This PR is the Playground-side
runtime change needed before the wp-extensions instructions can use a
published CLI release.

Related feature PR: adamziel/wp-extensions#1

Implementation

Adds sqlite3_auto_extension and sqlite3_cancel_auto_extension to the
Asyncify export lists in:

• packages/php-wasm/compile/php/Dockerfile
• packages/php-wasm/compile/php/Dockerfile-5-2

The markdown-editor command, mu-plugin, SQLite extension source, and
php-toolkit submodule are intentionally not in this Playground PR.

Testing instructions

git diff --check origin/trunk...HEAD

Full verification requires recompiling PHP.wasm and loading an external side
module that calls sqlite3_auto_extension(). The consumer lives in
adamziel/wp-extensions#1.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Exports SQLite auto-extension APIs from PHP.wasm builds so external side modules can register SQLite virtual table modules during PHP startup (needed by the markdown editor extension workflow).

Changes:

• Add sqlite3_auto_extension to the Asyncify-related symbol list for the PHP.wasm build.
• Add sqlite3_cancel_auto_extension to the Asyncify-related symbol list for the PHP.wasm build.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/php-wasm/compile/php/Dockerfile	Adds SQLite auto-extension symbols to the Asyncify symbol list for the default PHP.wasm build.
packages/php-wasm/compile/php/Dockerfile-5-2	Adds SQLite auto-extension symbols to the Asyncify symbol list for the PHP 5.2 PHP.wasm build.

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