[kongesque]

Summary

• Consolidate documentation into focused guides and references, add contributor guidance and a documentation index, and update release archive paths.
• Keep README onboarding self-contained, including Linux headless login, and align English, Japanese, Thai, and Traditional Chinese instructions.
• Prefer Letter Sealing when available. When LINE explicitly reports no E2EE support, send over HTTPS/TLS without repeated confirmation and identify the mode in the receipt.
• Use --require-e2ee as the only send encryption option. Remove the unreleased --allow-plaintext and --allow-non-e2ee flags while retaining capability checks, key validation, image restrictions, and the single-attempt mutation policy.
• Explain transport encryption versus E2EE and link LINE's official Encryption Report 2025 from the limitations sections.

Validation

• Native build, command help, and go vet passed for the send-policy implementation.
• Checked 267 local documentation links and anchors and the JSON example.
• Checked syntax for 176 shell examples without executing them.
• Checked matching command examples, options, technical fields, code blocks, and section counts across all four user-guide languages.
• git diff --check passed.
• All eight GitHub checks passed on commit 044bc65, covering Ubuntu, macOS, Windows, and the runner/LTSM regressions.
• The account-change send regression also passed locally. The user confirmed testing is complete. No live LINE actions were performed by Codex for these changes.

Merge status

Testing confirmed by the user; all eight CI checks passed on the tested commit.