feat: NoMemory/Cleaner memory system + doc update

- _sdk_local/ removed (moved to standalone sdk repo)
- internal/agent/core: NoMemory/Cleaner data-flow breakpoints
- internal/memory: clean_text, document store refactor
- internal/plugin/registry.go: plugin API alignment
- docs: PLUGIN_DEV.md, ARCHITECTURE.md NoMemory/Cleaner docs
- plan.md, review.md: status update

cmd/waiter/rawmode_defs.go

@@ -1,21 +0,0 @@
-package main
-
-type termios struct {
-	Iflag  uint32
-	Oflag  uint32
-	Cflag  uint32
-	Lflag  uint32
-	Cc     [20]byte
-	Ispeed uint32
-	Ospeed uint32
-}
-
-const (
-	TCGETS = 0x5401
-	TCSETS = 0x5402
-	ICANON = 0x2
-	ECHO   = 0x8
-	ISIG   = 0x1
-	VMIN   = 6
-	VTIME  = 5
-)

cmd/waiter/rawmode_other.go

@@ -1,9 +0,0 @@
-//go:build !linux
-
-package main
-
-import "fmt"
-
-func setRawMode(fd int) (func(), error) {
-	return func() {}, fmt.Errorf("raw terminal mode not supported on this platform")
-}