sync readline and console with upstream

[M09Ic]

Summary

• Sync embedded readline with official upstream 088046b via git merge result 916e20f.
• Sync embedded console with official upstream 7002774 / v0.3.1 via git merge result 92517a0.
• Preserve the local tui fork capabilities: terminal abstraction, remote/custom IO, paste references, inline suggestions, clipboard integration, terminal-aware console output, exported Console.Execute, and completion state hardening.
• Add docs/readline-console-upstream-sync.md documenting the recurring upstream sync workflow.
• Add fork regression tests so future upstream syncs fail if local terminal/paste/inline suggestion/Execute capabilities are removed.

Tests

• PASS: go test ./... in D:\Programing\go\chainreactors\tui\readline
• PASS: go test ./... in D:\Programing\go\chainreactors\tui\console
• FAIL: go test ./... in D:\Programing\go\chainreactors\tui
  • Existing root package vet failures: non-constant format string in fmt.Printf calls.
  • Existing example build failure: example/kvtable/main.go calls tui.RenderKV with the old argument list.

Fork regression coverage

• readline/fork_test.go: custom terminal input/output and inline suggestion API.
• readline/terminal/fork_test.go: stream control size and resize callback behavior.
• console/fork_test.go: NewWithTerminal, terminal-aware output, exported Execute, and inline suggestion bridge.
• Existing console/paste_test.go: paste reference behavior.

Notes

• Official readline and console now use go 1.25.0; the tui root module remains go 1.24.2.
• The root test failures are outside readline / console and were not mixed into this sync PR.