[sanohiro]

Current docs still described frame-local closures as escaping arena allocations, excluded file task transfers, and pointed readers to removed numeric process status APIs. This refresh aligns those descriptions with the compiler and synchronizes the English/Japanese guides and library references.

• Preserve The Little Aligner's question-and-answer style while adding owned task capture exercises and correcting checked read-window allocation and output flushing.
• Add HTTP listener/request-view and unfinished text-builder guidance; correct stale wait-proof, indexed-field and Web middleware descriptions.
• Remove repeated introductions, duplicated explanations and unsupported performance generalizations; distinguish historical process designs from the current API.

Validation: all 83 English/Japanese document pairs checked; 637 local link targets and 70 heading anchors resolved; 10 changed English/Japanese example variants pass both alignc check and check-per-unit on the current source. The compiled Web document receives its existing apps_web_multipart owner check and the repository's code-tier preflight. No compiler behavior or language design changes.