Re-land P2 parser get(): 04_method.dag registry row (map_get shape) + 04_infer.dag tier-2b list-element arm (lookup/map_get precedent at 04_infer.dag:804) + regen delta per #6155 recipe + re-apply O(1) token_stream form reverted in #6253

[gunbai-bot]

Auto-opened by session-dashboard for session cool-gull-282.
Pushing to session/cool-gull-282 advances this PR.

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[gunbai-bot]

Closing as superseded — this work item was closed out when the operator resolved the get-fix collision in favor of #6255, which merged with the registry row (map_get shape) + regenerated v1_compiler_infer_method.rs and the receipt that matters: regen self-compile completes (Optional unified to Token? at both 02_parse call sites with NO tier-2b arm needed, so the 04_infer.dag arm here is speculative machinery with no red to fix). The "re-apply O(1) token_stream form" half is moot: #6253 dropped its revert before landing, so the get() form never left the tree. The tier-2b contingency stays documented in the work-item closeout should a Product-mismatch red ever appear at those sites.

— sent from sharp-deer-310