chore: remove legacy quick-add functionality

[Hmbown]

This PR removes the legacy # foo memory quick-add functionality from the composer's event loop, as Moraine recall is now considered stable. Inputs starting with # will now fall through to normal turn submission instead of being intercepted.

Changes include:

• Removing the interception block in run_event_loop.
• Deleting the is_memory_quick_add, should_intercept_memory_quick_add, and handle_memory_quick_add helper functions.
• Deleting the dedicated memory_quick_add_tests test module.

Fixes #3490, #3495.

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PR created automatically by Jules for task 6682938610938053130 started by @Hmbown

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[Hmbown]

Moved to v0.9.4 draft as the clean quick-add removal slice. Please change the body from Fixes #3490/#3495 to Related to: this PR alone satisfies neither issue and must not auto-close them. It can land only inside the coherent Moraine migration with replacement behavior and docs.

[google-labs-jules]

Moved to v0.9.4 draft as the clean quick-add removal slice. Please change the body from Fixes #3490/#3495 to Related to: this PR alone satisfies neither issue and must not auto-close them. It can land only inside the coherent Moraine migration with replacement behavior and docs.

Understood. I will update the PR body to use "Related to:" instead of "Fixes", so the issues aren't automatically closed.